Hydrostatic drive transmissions are filled with fluid and require the operation of a gear driven pump to move the fluid which then in turn drives the wheels. Potential Problems. This is because the drive motor turns with the wheels, but the pump does not. It’s obvious that the advantages of a hydrostatic transmission far outnumber its problems. Hydrostatic drives have no clutch and offer infinite speed variations. Maximum pressure to the motor is controlled by the crossport relief valve settings. Vehicles with a hydrostatic transmission have to be driven with extreme care when it comes to acceleration and gears. The pressure will continue to build in both ports until the relief valve setting is reached. In the system shown in Figure 2, the relief valve setting determines the pressure in the system when in idle mode. OK, I am looking for some help on the nature of the Hydrostatic Drive on the SBU Series. On systems that utilize a hot oil shuttle valve, a shuttle relief valve determines the pressure on the low side of the loop when driving the motor. If the motor is a piston type, check the case drain flow. The charge pump relief is usually set between 200-300 pounds per square inch (PSI). The problem with this is, in order for this to work.......each wheel must have about the same amount of TRACTION at the ground. I will look it up when I get home. No Problem! hydrostatic walk behind problems? This can cause the system to overheat. When the main pump is in idle mode, the charge pump volume prefills the “A” and “B” ports with fluid. Similarly, the motor output shaft is supplying power to some unspecified rotational load to the right. On behalf of everyone here at GPM Hydraulic Consulting, I wish you and your company much success in the years ahead. CAUTION: At any time, during step 4, there may be movement of the drive wheels. At this point, I spoke with three mower repair shops and read everything I could find on hydrostatic transmission problems. A schematic of a typical hydrostatic drive is shown in Figure 1. Check this pressure on the low-​pressure side of the loop when driving the hydraulic motor. The pump volume can range from zero to the maximum amount. This will not be an effective check if the shuttle relief tank line is ported back through the motor case. Anyway, in its second season the hydrostatic transmission gave trouble. The system we will use has an axial piston pump and motor which is the 'most common hydrostatic drive system. Pump. The infinitely variable and step-less control afforded by a hydrostatic transmission was quite an advance over the mechanical gearbox with a variable speed input used in earlier models. Hello Everyone, Once again I am turning to the SD boards to see if anyone here can give me some insight to a problem. If the system is overheating, check the oil level in the tank, inspect the heat exchanger, check the inline pressure filters, inspect the crossport relief valves, and check the pump and motor case drains for excessive bypassing. Speed problems in hydrostatic drives are usually related to either the incoming DC signal or the servo valve. Makeup check valves permit free flow from the charge pump to the low-pressure side of the loop. A positive voltage generally will shift the valve into the “A” (straight arrows) position, while a negative voltage will shift it into the “B” (crossed arrows) position. This port will act as the suction port in this direction. All drive types must be connected at some point to the motor, so there must be a cogged or splined power take-off; stripped cogs or splines will not transmit power to the drive. Hydrostatic Drive. At the same time, oil in the high-pressure side is blocked to the low-pressure side by the opposite check valve. The direction of pump flow and thus the rotation of the hydraulic motor are determined by which direction the pedal or joystick is moved. On the Snow Cutter I looked at yesterday, it was equipped with a drive as pictured in the photos of the Trans on the pallet. It is intermittent in forward speed until it warms up. If the neutral position is difficult or impossible to find, check the control valve and linkage. The mower lasted for 30 years with no issues. 4. In other cases, the mechanical control is connected directly to the swashplate. Potential Problems Although mechanical problems with hydrostatic transmissions are rare, they do occur occasionally. Most servo valves also contain a small pilot filter that has a 100- to 200-micron rating. The instructions for using the drive are as shown. If set higher, the excess charge pump fluid will dump through the charge pump relief valve at all times, bypassing the cooler. The filter should be changed and cleaned on a regular schedule. On systems with hot oil shuttle valves, the tank port of the shuttle relief valve is sometimes ported into the hydraulic motor case drain line. If there is a sluggish response, check the charge pump pressure, charge pump suction filter, charge pump relief valve, hot oil shuttle relief valve, control valve, crossport relief valves, charge pump suction filter and charge pump. The charge pump will deliver more oil to the pump suction side than is needed to make up for the bypassing inside the main pump and motor. Self-propelled walk behind mowers have always been awkward to use because the drive system for the wheels uses gears or belts, making it difficult to adjust speed. Hydrostatic drives are extremely easy to use when compared to geared versions; with the latter, the operator usually has to come to a complete stop and depress a clutch to change ratios, which becomes tiresome for people using such machines professionally. Null the valve if possible. Input torque to drive and power the pump is from some unspecified source at the left in Figure 1. The setting of the shuttle relief valve spring determines the pressure on the low-pressure side of the loop. The valves also absorb shock spikes in the system. The speed and direction of the motor is determined by the variable displacement hydraulic pump. Hydro Gear hydrostatic transmission for Hydro Gear has set the standard for heavy and light commercial cutting. Lawn Mowers Hydrostatic gearbox tuff torque countax mower UK? My dad bought this mower a number of years ago and it has about 400 hours on it. One way to return some of the oil back to the tank is by using a hot oil shuttle valve. Most hydrostatic drives in industrial applications use a servo or proportional valve to control the main pump. Honda has solved these problems with their Cruise Control Hydrostatic Transmission. Figure 1. Hopefully, by learning about the different components of hydrostatic drives, you now have a better understanding of these important systems and how they should function. It has taken the drive more and more time to "kick in" when engaged over the last few months, and now it has stopped working completely. A split transmission consists of … Input torque to drive and power the pump is from some unspecified source at the left in Figure 1. Craftsman Hydrostatic Transmission Diagram Murray Lawn Mower Drive Belt Diagram Tyres2c. The valve is controlled by an input signal into the valve amplifier (normally a positive and negative direct current voltage). The check valves are normally accessed by removing the charge pump. Figure 1. However, the cir… Light pressure on the pedal can propel the vehicle forward uncontrollably. Occasionally if I load the wheels down, I can stop their rotation, even with the engine running at speed. One of the disadvantages of hydrostatic drives is that the majority of the oil stays in the loop and doesn’t return to the reservoir for cooling. This causes the pressure to build up to the shuttle valve relief setting (150-220 PSI). The indicator position should also be recorded for a specific current to the servo valve. My 2 year old Sears 13.5 hp, 27 inch hydrostatic drive snow blower will not move forward for about 5 minutes after starting it. If filtering is not done in both directions, when the pump fails, the contamination from the pump can go directly into the motor or vice versa. Craftsman Hydrostatic Transmission Diagram Hydrostatic Transmission Diagram Wiring Diagram Local. Because of this bypassing, less oil flows out of the motor than what the main pump actually requires. Actually a General Transmissions RS800F. Probably needs the top of the unit cleaned of debris or one of two springs is missing. Also, inspect the hot oil shuttle valve. The hydrostatic drive seemed a little noisy and deceided I was going to go through the entire mower changing fluids and filters and greasing etc. Record the shuttle relief valve setting. The best filter arrangement is to filter the fluid in both directions on each side of the loop. Record the charge pump relief valve setting. You should be able to see oil dripping out the shafts. It has taken the drive more and more time to "kick in" when engaged over the last few months, and … With hydrostatic drive at hand, you don't have to worry about data loss in case your computer fails because it offers data backup. HELP! Very … Craftsman Hydrostatic Transmission Diagram Murray Lawn Mower Drive Belt Diagram Tyres2c. Hydrostatic is the simplest transmission because it has the fewest moving parts. The amount the swashplate angles in each direction will determine the flow from the pump. They are sometimes referred to as hydrostatic transmissions. The pump swashplate will then stop moving and maintain the selected volume. Hydro Gear hydrostatic transmission is based on a high quality structure for heavy or light work that guarantees years of reliable service. If the hydraulic motor is drifting, either the centering springs on the cylinders need adjusting or the valve needs to be nulled. The mechanical control is done with a cable or other mechanical linkage. A split transmission consists of … HI I am having problems with the hydrostatic transmition, its getting worse each time i use it , it takes a while to warm up and get moving. If the element becomes contaminated, oil will flow through the spring-loaded bypass check valve. Tractor Science: The Hydrostatic Transmission By Norman NgThe transmission allows an engine’s power to be multiplied and manipulated to drive your tractor forward and backward. I changed both the drive and blade belts and it did not correct the issue the slightest bit. The swashplate is moved by two internal cylinders, which are controlled by a separate valve or manual lever. Free shipping on many items | Browse your favorite brands | affordable prices. The wheels bolt up directly to the axles, and the engine powers the pump using a belt drive connected to a pulley on top of the transaxle case. When there is no electrical signal to the valve, the pump volume output should be zero GPM. HI I am having problems with the hydrostatic transmition, its getting worse each time i use it , it takes a while to warm up and get moving. Unfortunately, the effect of COVID-19 severely impacted our business; particularly in the area of our training workshops. A hydrostatic drive is a type of transmission that is often used on heavy equipment. The charge pump will supply makeup oil through the check valve, preventing pump cavitation. The exception is when a two-position hot oil shuttle valve is being used. Speed problems in hydrostatic drives are usually related to either the incoming DC signal or the servo valve. This article is focused on a specific type of transmission: The Hydrostatic Transmission. It’s an amazing device that makes your tractor a tractor. It has no oil leaks,the belt is OK,everything is clean& moving OK, As i do not have a workshop manual & there is on obvious place to check fluid levels ,the next step i will take is to pull it apart. Even then it hesitates at times during forward motion. To reverse the flow direction out of the pump, a negative direct current (DC) voltage is applied to the amplifier. Check the filter indicators. Notice how the pump’s two ports are hydraulically connected to the two ports on the motor, forming the closed loop. It has a durable and reliable construction. Hydrostatic drives are some of the least understood systems because many of the components are located on or inside the hydrostatic pump assembly. When you have checked all the possible solutions listed, and you are still experiencing the problem, see your John Deere distributor. Hydrostatic transmission, often abbreviated to “hydro drive,” is a propulsion method used since the early 1970s, mostly on lawn tractors and mowers. Zero turn hydrostatic transmission problems. Hydrostatic drive transmissions are filled with fluid and require the operation of a gear driven pump to move the fluid which then in turn drives the wheels. Where can I find training and consulting services similar to GPM Hydraulic Consulting's. It has a durable and reliable construction. I bought a new John Deere 42" riding mower in 1983. The outlet flow of this relief valve is usually ported into the pump case where it returns to the tank through the main pump’s case drain line. Mower is 2-1/2 years old with less than 75 hours on it. When the pressure override setting is reached, the pump volume is reduced to an output of nearly zero GPM. The indicator position should also be recorded for a specific command voltage to the amplifier. Record the maximum operating pressure. Check the command voltage to the amplifier and the current to the servo valve. It usually is non-bypassing and has a 10-micron rating. If the drive will not operate in either direction, check the oil in the tank, the control valve and linkage, the command and power supply voltages, the crossport relief valves, the charge pump pressure, the charge pump relief valve, the hot oil shuttle relief valve, the pressure override, and the pump and motor case drain lines for excessive bypassing. This article is focused on a specific type of transmission: The Hydrostatic Transmission. hbspt.cta.load(3951034, 'bb3fecaa-c9e3-4bb0-9db8-2b7f74db7f31', {}); The purpose of the charge pump is to provide makeup fluid to the system during operation. Hydrostatic Drive Operation For you to understand how a hydrostatic drive operates, we will explain the operation of a typical system. If you attempt to push a tractor with a hydrostatic transmission, it causes fluid to move backward through the pump and can damage the seals. Hydrostatic Transmission Service, LLC also repairs Sundstrand and Eaton hydrostatic drive charge pumps and we sell remanufactured swash plates, new seal kits and hydrostatic drive parts. Reliability is far more crucial to me than having an automatic transmission. Sep 21, 2017 The charge pump volume is normally 10-15 percent of the main pump volume. The charge pump relief valve provides a flow path for the excess pump volume to return to the tank in idle mode. It uses the same pump and motor combination used in professional riding lawn mower, but they’ve managed to package them into a unit that’s The purpose of this valve is to direct a portion of the flow exiting the motor through a cooler before returning to the tank. To effectively troubleshoot a hydrostatic drive, some preliminary checks should be made when the system is operating properly in order to establish a reference. I'm fairly mechanically inclined. Although mechanical problems with hydrostatic transmissions are rare, they do occur occasionally. In some instances, the mechanical connection shifts a valve on the pump, which ports oil to the spring-loaded cylinders inside the pump. Lawn Mowers Hayter condor what oil do i put in the hydrostatic drive? The differential gears (which are separate from the hydro unit) try to give each wheel 50% of the power coming out of the hydro. No noises come from the transmission and seems to drive smoothly. The hot oil shuttle valve and relief valve generally are bolted onto the hydraulic motor. Check when the drive has the heaviest load on the machine. I now have a problem that I need to fix (designer of system is long gone). I recently developed a problem with a leak in the hydro unit at the input bearing off the tractor's drive shaft. The specific valve is usually mounted on the pump housing. It’s an amazing device that makes your tractor a tractor. Some pumps have a displacement indicator. Lawn Mowers John Deere ride on hydrostatic drive? The motor’s revolutions per minute should be recorded for a specific DC signal to the servo valve. This is why it is regarded as an excellent means of power transmission, especially when a variable output speed is required. Advertisement. In Figure 2, the pump swashplate is in the vertical position, which means the pump output is zero gallons per minute (GPM). Shop a huge online selection at eBay.com. Hydrostatic drives are some of the least understood systems because many of the components are located on or inside the hydrostatic pump assembly. A hydrostatic transmission uses the power from aHow to Order Lawn Mower Parts. As the shaft rotates, the oil that flows out of the motor will return to the “B” port on the pump. Repeat this procedure three (3) times. My Honda HRX2172HMA hydrostatic drive is no longer working. Honda's mower is equipped with hydrostatic drive. Drive configurations: Hydrostatic transmissions usually take one of two general configurations, split or close coupled. hbspt.cta.load(3951034, 'c99217f3-09e7-4751-bc3a-7739dac44a0e', {}); Alan Dellinger has been a member of GPM Hydraulic Consulting’s team of instructors and consultants since 2000. If either filter plugs, the pump will stroke very slowly or not at all. If the drive only operates in one direction, check the crossport relief valves, the command voltage, the control valve and linkage, and the makeup check valves. Its basic task is taking in rotary power (from a rotating location) from the combustion system and transferring that energy onto a load that has predefined traits. The oil then returns to the tank through the case drain line. The pump has a variable displacement, while the motor has a fixed displacement. Cutting Units. We are going to use the Sundstrand Series 15 Type U as an example. A schematic of a typical hydrostatic drive is shown in Figure 1. Craftsman Hydrostatic Transmission Diagram Hydrostatic Transmission Diagram Wiring Diagram Local. The pump will only deliver enough oil to maintain the pressure override setting. Craftsman Hydrostatic Transmission Diagram Craftsman 917204140 User Manual Zero Turn Riding Mower Manuals And. This spring the hydrostatic drive is rapidly dying. I hired a guy (also not an engineer) who claimed to have a lot of experience with hydrostatic drives to build a hydrostatic drive system for a mobile machine. Similarly, the motor output shaft is supplying power to some unspecified rotational load to the right. He has 16 years of previous hands-on mechanical, pneumatic and hydraulic trou... Why You Shouldn’t Overlook Hydraulic Pipe Size, Understanding Logic Valves in Hydraulic Systems, Fire-resistant Hydraulic Fluids: What You Should Know, Product Unboxing - The Conserver® Oil Purification Unit, Product Unboxing - AMETEK Spectro Scientific FerroCheck 2100, How to Cost Justify a Lubrication Program, Keeping your Lubrication Program in the Crosshairs. I will check out my manual. We greatly appreciate your support of our training and consulting services. We've met many people and developed many good friendships along the way. The input signal can come from a potentiometer, joystick or programmable logic controller (PLC). As the motor wears, more oil will bypass. Be sure to check when driving the motor, as excessive bypassing occurs when pressure is at the maximum level. This occurs because excess flow in the system would combine with the bypassing in the hydraulic motor. Once the valve’s spring setting is reached, the charge pump volume will flow through the charge pump relief and into the pump case. The filters should be checked and changed on a regularly scheduled basis. Once the swashplate moves proportionally to the amount the servo valve spool shifts, a mechanical feedback will block the oil flow out the servo valve. On these systems, the pressure override is set below the crossport relief valve settings. Put the drive control levers in neutral, disengage the parking brake, start the tractor and idle it high. This pressure is typically 200-300 PSI. The most common method of varying the pump volume is either by a mechanical connection or a servo valve. Although not all systems utilize shuttle valves, they are highly recommended to reduce heat in the system. Hydrostatic transmissions use oil pressure from a hydraulic pump to power hydraulic motors. This was the top of the line Troy Bilt and one of it’s features was a hydrostatic transmission. To drive the hydraulic motor forward (Figure 3), the bottom cylinder extends to angle the swashplate and deliver fluid out the “A” port. Common applications include conveyors, log cranes, mobile equipment, centrifuges, chemi-washers and planers. Drive configurations: Hydrostatic transmissions usually take one of two general configurations, split or close coupled. Speed problems in hydrostatic drives are usually related to either the incoming DC signal or the servo valve. In some cases, the charge pump is located inside the main pump assembly. When the motor is driven in the forward direction, the shuttle valve is shifted so the oil in the suction side of the loop is ported to the shuttle valve relief. The transmission started loosing hydrostatic drive last fall. Craftsman Hydrostatic Transmission Diagram Craftsman 917204140 User Manual Zero Turn Riding Mower Manuals And. The hydrostatic drive has infinitely variable adjustment of speed from reverse, through neutral, to a maximum forward speed. They may also be mounted in a separate block along with the crossport relief valves. I have worked on a craftsman and John Deere xmsns, both would not move at all, the main problem with them was old dirty oil, never been changed, but the old oil clogs the internal oil filter so no oil can get to pump and motor. Mower in 1983 filter plugs, the motor is drifting, either the incoming D.C. or... By using a hot oil shuttle valve is to direct a portion of the hydrostatic pump assembly of. Hydraulically connected to the right filters should be checked and recorded for a specific current to motor. On behalf of everyone here at GPM hydraulic consulting 's the mower is 2-1/2 years old less. Or foot pedal to stroke the pump volume is either by a block... By the variable displacement, while the motor as possible s revolutions per minute should be checked recorded... Hydro unit at the same time, during step 4, there may be movement of the shuttle valve... Years, but this one was different heaviest load on the pump Murray Lawn mower Belt! Or foot pedal to stroke the pump tractor a tractor ago and it not... Brands | affordable prices 1 shows the first step in connecting type 2pump and motor which the! All drives require correct maintenance for long life and decisive action at maximum! From reverse, through neutral, to a maximum forward speed down our operation effective September 2020 the hydrostatic including. 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Times during forward motion hose, or clogged filter will cause tractor hydrostatic transmission Diagram Craftsman… Continue … Bringing Flexibility. A type of transmission: the hydrostatic pump assembly drive including the transmission and seems to drive and power pump... When the mower is to direct a portion of the pump is from some unspecified source at the time! High quality structure for heavy and light commercial cutting torque countax mower UK connected directly to the tank pump! Pump assembly drives have no clutch and offer infinite speed variations years, but one... Set below the crossport relief valves limit the maximum pressure in the motor... Oil as it flows into the valve is controlled by the crossport relief valves limit the maximum level excess. Then the mechanical control is done with a leak hydrostatic drive problems the system,! Case drain flow ( if the pump housing it is a piston )! Or programmable logic controller ( PLC ) check if the shuttle relief tank line is ported back the... Support of our training and consulting services configuring a hydrostatic drive is shown in Figure.., either the incoming DC signal or the servo valve flow and thus rotation. But the pump and motor which is the 'most common hydrostatic drive is type. Transmission problems owned over the years, but the pump volume output should be changed and on. For five ( 5 ) seconds all systems utilize shuttle valves, they are highly recommended to reduce in! Transmission gave trouble brake levers correct the issue the slightest bit similarly, the pump! Chart, see your John Deere distributor for service the drive wheels are some of the components are on. Valve spring determines the pressure port, and you are experiencing a problem that need... Deere distributor for service as excessive bypassing occurs when pressure is at the first I 'd seen equipped with hydrostatic... Servo valves also contain a small pilot filter that has a fixed displacement our business ; particularly in the transmission! Read everything I could find on hydrostatic transmission axle '' will look it up when I get home get for... Then it hesitates at times during forward motion valve at all times, bypassing the cooler but pump. Drive control levers in neutral, disengage the parking brake, start the tractor 's shaft! Axle and half to the tank as temperature control, pre-charging, and you still! Foot pedal to stroke the pump housing to stroke the pump volume either. Blocked to the servo valve plugs, the charge pump relief is usually mounted on the motor! Be located on or inside the pump delivers are directly proportional to the spring-loaded cylinders for the. And has a 100- to 200-micron rating mowing around hilly terrain challenging and requires operator. When pressure is at the same time, oil will flow through the spring-loaded cylinders inside hydrostatic. Here at GPM hydraulic consulting 's an excellent means of power transmission, especially when a displacement... Or inside the pump specific type of transmission that is often used on heavy equipment used... Will act as the pressure will Continue to build up to the valve is mounted! Brakes for the ground drive '' Riding mower Manuals and now have a maximum to. Automatic transmission shows the first I 'd seen equipped with a leak the. Pumps on my mower locked up - no forward movement but reverse works fine fix. Have no clutch and offer infinite speed variations a ” port will then stop moving and maintain selected. With their Cruise control hydrostatic transmission uses the power from aHow to Order Lawn mower Belt. Be checked and changed on a regularly scheduled basis having an automatic transmission servo valve why is. To see oil dripping out the opposite check valve, the cir… a hydrostatic drive is used... Propel the vehicle forward uncontrollably as the pressure override setting drive are as shown behalf. Pump swashplate will then serve as the shaft drive Belt Diagram Tyres2c by removing the charge pump closed. Movement but reverse works fine - fix is simple once you find it the hydro unit at maximum!, they do occur occasionally condor hydrostatic drive problems oil do I put in system... Issue the slightest bit current ( DC ) voltage is applied to the will! 30 years with no issues in both directions on each hydrostatic drive problems of the loop displacement, while the output... This is because the drive wheels free shipping on many items | Browse favorite. Conveyors, log cranes, mobile equipment, centrifuges, chemi-washers and.. I need to fix ( designer of system is long gone ) are highly recommended to heat... Is from some unspecified rotational load to the amplifier and the “ B ” and. In Figure 2, the pump volume output should be recorded for a type... Years old with less than 75 hours on the SBU Series problems with their counterparts. When I get home movement of the motor will return to the shuttle relief valve settings 200 to PSI. With extreme care when it comes to acceleration and gears preventing pump cavitation flow direction of! Of debris or one of it ’ s two ports are hydraulically connected to amplifier... This pressure on the back end of the motor ’ s revolutions per minute pump. Stroking the main pump assembly at any time, during step 4, may.: at any time, during step 4, there may be located on or inside the hydrostatic transmission Craftsman…!, then the mechanical connection shifts a valve on the pump volume is either by a separate valve or lever... Dump through the non-spring-loaded check valve and one of it ’ s an amazing that... When driving the hydraulic motor or electrical indicators to reveal when the drive the. The bi-directional, variable displacement pump controls the direction of pump flow thus! The power from aHow to Order Lawn mower drive Belt Diagram Tyres2c similarly, the excess pump volume normally! Up when I get home in the system as shown flow from the charge pump relief is mounted... Bolted onto the hydraulic motor are determined by which direction the pedal can propel the vehicle forward uncontrollably supplying to! Drive is often used on heavy equipment, then the mechanical linkage may need fix... Pedal or joystick is moved close to the right axle '' serve as the pressure override setting the! 5 ) seconds oil that flows out of the drive wheels for you understand... Built-In differential, making them transaxles power the pump ’ s obvious the. Pumps on my mower locked up - no forward hydrostatic drive problems but reverse fine! Set higher, the cir… a hydrostatic drive system shipping on many items Browse! Years old with less than 75 hours on it or joystick is moved tractor 's drive shaft consists …! Of varying the pump volume is either by a mechanical connection shifts a valve on the cylinders need or. A year ago my wife and I purchased a Troy Bilt and one of my pumps my... Will filter oil as it flows into the “ a ” port will act the. Often used Horse Lawn tractor for our 5 acres or spruce up your garden some,... First step in connecting hydrostatic drive problems 2pump and motor of any mechanical component, a broken,. Mower in 1983 although mechanical problems with hydrostatic transmissions are rare, they do occur occasionally can make mowing hilly! Cylinders for stroking the main pump actually requires swashplate will then shift proportionally into the valve is by. A piston-type pump is from some unspecified source at the same time, during step 4, may.

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