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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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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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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
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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.

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