Template Name: OML_2_col Template Date: 1994_04_22
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844/642 Telehandler
HYDRAULICS EXTENSION CYLINDER COUNTERBALANCE VALVE DIRECT TEST AND ADJUSTMENT
STEP 57
STEP 58
1 3 G0505046
Retract the boom to the end of the extension cylinder s tro ke a nd h o ld th e joys tick in th e RE TRAC T position. The pressure gauge should read 3000 psi (207 bar). If the pressure is less than 3000 psi (207 bar), go to Step 46 of the EXTENSION CYLINDER QUICK TEST. If the pressure is 3000 psi (207 bar), proceed to the next step. If the pressure is more than 3000 psi (207 bar), go to the Main Control Valve Pressure Relief Test and Adjustment section of this manual before proceeding to the next step.
2 G0805058
Shut off the engine. Remove the pressure gauge. Remove the hose (1) from the retract bulkhead fitting (2). Install a 5000 psi (345 bar) pressure gauge (3) between the hose (1) and bulkhead fitting (2).
STEP 59 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) as the boom is retracted. If the gauge is not at 1500 psi (103 bar), proceed to the next step.
PRINTED IN U.S.A.
601-27
913250
