Hyster Forklift RS46-38LS IH

WARNING: Lower boom completely before working on control valve or hydraulic system. The boom can lower suddenly and cause injury if the boom is not lowered.

Is the truck placed on a solid and level surface?

Is the boom lowered and the shutoff valves at the bottom of the hydraulic tank platform closed?

WARNING: Move all control levers back and forth a minimum of 20 times to remove all hydraulic pressure from pilot system.

Are the covers on the topside of the frame removed?

Are tags for identification put on hydraulic lines?

Are the hydraulic lines disconnected from the cab manifold?

Are caps put on the open lines, ports or other connectors?

Shut down the engine and apply the parking brake.

Apply brakes minimum 10 times to relieve hydraulic pressure.

Remove the capscrews retaining the cover of the filters. See Figure 13.

Carefully remove the filter cartridge.

Verify the O-ring is in good condition. Replace if necessary.

NOTE: The pressure reducer valve is adjustable. If a setting pressure is not within specifications, adjust the valve.

Lower lift cylinders completely

Connect a 0 to 7 MPa (0 to 1015 psi) gauge to check port MPLT

Start engine. Run engine until temperature of hydraulic oil is 55 to 65 C (130 to 150 F). Check pressure at idle speed.

NOTE: Correct measurement can be achieved during movement (flow) of the main spool.

Check if pressure is 5 MPa (725 psi)

If pressure is not correct, adjust pressure reducer valve

!WARNING: Lower boom completely before working on control valve or hydraulic system. The boom can lower suddenly and cause injury if the boom is not lowered. This procedure will make sure that the boom cannot lower suddenly and cause injury or death.

!NOTE: All valves, and other associated items installed on the load holding valve can be replaced. Before removal of any part, check that the area is clean and protected against dirt and fluid contamination.

Place the truck on a solid and level surface.

Lower boom and close the shutoff valves at the bottom of the hydraulic tank platform.

!WARNING: Move all control levers back and forth a minimum of 20 times to remove all hydraulic pressure from pilot system.

Put tags for identification on electrical wires. Disconnect the electrical wires from the load holding valve.

Put tags for identification on hydraulic lines. Disconnect the hydraulic lines from the load holding valve. Put caps on the open lines, ports or other connectors.

Remove the four capscrews that fasten the load holding valve to the rear side of the outer boom.

NOTE: Only use plugs that have been cleaned in solvent.

NOTE: In the event that seals are missing, check manifold for missing seals and remove.

NOTE: Cartridge valves are not field serviceable with exception of external seals and electrical solenoids. In event of a defective component, completely replace valve.

NOTE: Check load holding valve for cracks. If there are cracks in load holding valve, the load holding valve must be replaced.

The valve seals are serviceable parts of the load holding valve. Use the following procedures for repair:

Unscrew the cartridge valve from the load holding valve.

Check that all seals are attached to cartridge valve.

Install a temporary plug in place of cartridge valve.

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