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My hydraulic pump lifts actuators up and down.

My small hydraulic pump lifts actuators up and down. Works fine on up but motor strains and cuts out on down.Have tried reversing lines but same thing.

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  • stan_911 May 19, 2009

    Thanks very much - I have already checked the cylinders - they check out OK. I really think it is the valve in the pump.

  • stan_911 May 19, 2009

    Thanks very much - I have already checked the cylinders - they check out OK. I really think it is the valve in the pump.

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  • 9 Answers

With NO PREASURE on the hyd system or the cylinder ( brace it )unhook both hoses from the hyd cylinder and hook together ( may require a made up hose or special fitting ), then operate the system again. If it bogs down again you KNOW it's not a cylinder problem ( piston dammage, bent rod, piece of metal stuck in a cylinder port...) . With the hoses hooked up normaly, you possiably have a restriction on the rod side ( pressure down to the cylinder) of the control valve. I have seen a piece of piston stuck in the port fitting because it could not go by the spool. Or depending on allot of variables, you MAY have a " flow control valve " that will control the decent speed of the cylinder failing or out of adjustment ( fixed orficed check valve or manual gate ). these are normally in the barrel line of the cylinder, but that depends on the configuration of the cylinder.Good luck and be carefull!!!

Posted on May 19, 2009

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2 Answers

John deer 950 very slow loader hydraulics. Changed fluids, filters, still same issue. 3pt seems to work fine and curl function on FEL seems closer to normal. Lift is where it is really slow. Tested...


a small twist in a line can do that, or a soft line.... mine,(rubber hose connecting the filter housing to the metal tube going to the hydraulic pump) mounted to the filter housing under the right floor had a weak sidewall and sucked flat
that's where I'd start. Been there! different model but was surprised what a small twist did and a soft line.

Feb 20, 2018 | Garden

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John deere 445 no reverse


you have air in your hydrolic line crack open line and let the air bleed out

Sep 08, 2014 | Garden

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On my bobcat 743 how can i bleed air from my hydraulics


Most hydraulics will self bleed by using them. For some cylinders you can position them so that one inlet will be at physically at the top, actuate that set so that it fills the cylinder on the upper end, let it settle for a few seconds to allow air to move to the top, then actuate it the other way, pushing the oil and air out the top. Reverse the cylinder position so that other end is at top and do it again, fill cylinder from top and allow air to rise then actuate it to push air and oil out again. Repeat several times.

I know you can't get all cylinders to a vertical position so that you have a true top and bottom but the idea is to get one cylinder inlet up while the other is down and the reverse the position.

Other portions of the hydraulic system should bleed all air out of the as you use it or will have bleed ports that allow small amounts of air out and you shut them when oil comes out, such as brake and clutch systems.

If you continue to get lots of air in the system you have a leak on the suction line from the tank to pump.

Aug 27, 2012 | RTO Construction Bobcat by Woody Click

1 Answer

Top worked fine yesterday but today tried to let down only clicked


It is a hydraulic pump that applies pressure to the 2 hydraulic pistons to raise & lower the top. So, check for something obstructing movement first.

The convertible top:
  • is motor-driven.
  • requires parking brake engaged to complete circuit for operation.
  • is equipped with a back window glass (42006) . The back window glass is permanently attached to the folding top back window curtain (52500) and cannot be opened.
--------------------------------------------------------------------------------------------------------------------------
VISUAL INSPECTION CHART Mechanical Electrical
  • Damaged fluid reservoir.
  • Damaged folding top hydraulic cylinders .
  • Damaged folding top motor upper and lower hose .
  • Damaged convertible top regulator.
  • Parking brake not engaged.
  • Open power distribution box circuit breaker CONV TOP (30A), fuse junction panel Fuse 1 (15A).
  • Circuitry open/shorted.
  • Damaged convertible top switch.
  • Damaged raise/lower relay .
  • Damaged folding top hydraulic lift motor and plate kit .


  • Convertible Top Does Not Raise/Lower
  • Open circuit breaker or fuse.
  • Circuitry open/shorted.
  • Damaged folding top switch.
  • Damaged raise/lower relay .
  • Damaged folding top hydraulic lift motor and plate kit .
  • Parking brake not engaged.


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Jun 29, 2011 | 1998 Ford Mustang

1 Answer

To remove 1993 mustang conv. top cylinders should top be up or down? thanks, bill


don't have 93. here's 94

Motor Assembly, Convertible Top Removal and Installation
NOTE: The folding top hydraulic cylinder rods should be in the fully retracted position.
Use absorbent rags or a container to catch any hydraulic fluid that leaks out when removing the fittings.
  1. Remove motor and pump assembly as outlined.
  1. Loosen each folding top motor upper and lower hose fitting on the sides of the folding top hydraulic lift motor and plate kit (533A00) .
  1. Remove the folding top hydraulic lift motor and plate kit .
  1. Remove each of the service folding top hydraulic lift motor and plate kit plugs one at a time and attach the tee fitting to the replacement folding top hydraulic lift motor and plate kit . NOTE: Make sure that the o-ring is installed in the bottom of each folding top hydraulic lift motor and plate kit port before attaching the hose tee fitting.
  1. Connect the folding top hydraulic lift motor and plate kit unit to a 12-volt power source and cycle the folding top hydraulic lift motor and plate kit in and out several times to purge the air from the folding top motor upper and lower hoses (53390) . Some noise squeal may be noticed due to the air. srb~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not overfill or the reservoir seal could be blown out.
  1. Carefully remove the rubber fill plug from the back and the reservoir and check the fluid level. The level should be at the bottom of the filler hole. If necessary, add Synthetic Mercon® Multi-Purpose Automatic transmission fluid E6AZ-19582-B (ESR-M2C163-A2) or equivalent.
  1. Replace the fill plug with a new fill plug.
  1. To install, reverse Removal procedure.
-------------------------------------------------------------------------------------------------------------------------------
Section 01-17: Convertible 1994 Mustang. Workshop Manual
REMOVAL AND INSTALLATION Lift Cylinder, Power Top Removal and Installation
NOTE: The cylinder rods should be in the fully-retracted position.
  1. Remove pump and motor as outlined.
  1. Remove the upper and lower hose fitting from the folding top hydraulic cylinder (50600) . Use absorbent rags or a container to catch any hydraulic fluid that leaks out when removing the fittings.
  1. Remove each of the service cylinder plugs one at a time and attach the hose fittings. NOTE: Be sure each fitting is installed in the correct position on the folding top hydraulic cylinder .
    NOTE: Make sure that the tetra seal is installed in the bottom of each of the folding top hydraulic cylinder ports before attaching the upper and lower hose fittings.
  1. Connect the folding top hydraulic lift motor and plate kit (533A00) to a 12-volt power source and cycle the folding top hydraulic lift motor and plate kit in and out several times to purge the air from the hoses. Some noise squeal may be noticed due to the air.
  1. Carefully remove the rubber fill plug from the back and the reservoir and check the fluid level. The level should be at the bottom of the filler hole. If necessary, add Synthetic Mercon® Multi-Purpose Automatic transmission fluid E6AZ-19582-B (ESR-M2C163-A2) or equivalent.
  1. Replace the fill plug with a new fill plug.
  1. To install, reverse Removal procedure.

Jan 21, 2011 | Ford Mustang Cars & Trucks

1 Answer

The hydraulic steel line on my 2010C bucket loader broke and I dumped a good amount of fluid before shutting everything off. Replaced line and filled tank up, everything worked fine for about 1/2 hour,...


Like other hydraulic systems, there is probably a procedure for bleeding the lines after loss of most of the fluid. You may still have air trapped in the system and once it works its way to the cylinder, the cylinder is working with air instead of fluid and the air compresses instead of doing work.

Sep 16, 2010 | John Deere 420,1020,2010,2020,2510,2520...

1 Answer

Testing Simrad Autopilot RPU160 Reversible Pump (21118237)


yes, hook it to 12V it runs, reverse wires it runs opposite it will spit oil, watch out! shoulda coulda left it in place and tested with jumper cables or battery if pump is bad 1 find out why your boat eats pumps 2. call me, i have it in stock for less than you paid before (most likely) 3. you can replace the electric motor without disturbing the hydraulics!!!
847-746-0100

Sep 13, 2009 | Simrad Rpu160 Reversible Pump 21118237

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