844/642 Telehandler HYDRAULICS

STEP 52

Replace the boom extend relief valve.

STEP 53

Repeat Step 51.

If the pressure is less than 3000 psi (207 bar), repair or replace the extend/retract control valve.

STEP 54

Shut off the engine. Remove the pressure gauge (1) from the bulkhead fitting (2) and install the cylinder extend hose (3) on the fitting.

Extension Cylinder Counterbalance Valve Quick Test

STEP 55

Install a 5000 psi (345 bar) pressure gauge and hose on the “MP” test port of the flow divider.

STEP 56

Start the engine and run at 1000 RPM. Extend the boom approximately 6 feet (2 meters). Watch the pressure gauge as the boom is slowly retracted, the gauge should read 1500 psi (103 bar).

If the pressure is less than 1500 psi (103 bar), proceed to the next step.

If the pressure is more than 1500 psi (103 bar), proceed to Step 60.

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