844/642 Telehandler HYDRAULICS

STEP 48

Extension Cylinder Relief Test

STEP 50

Start the engine and run at 1000 RPM. Move the joystick into the BOOM RETRACT position and hold. The pressure gauge should read 3000 psi (207 bar).

If the pressure is 3000 psi (207 bar), repair or replace the extend/retract cylinder.

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

STEP 49

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

Remove the hose (1) from the extend bulkhead fitting (2). Install a 5000 PSI pressure gauge and adaptor (3) on the bulkhead fitting (2) and plug the hose end (1).

STEP 51

Start the engine and run at 1000 RPM. Move the joystick into the BOOM EXTEND position and hold. The pressure gauge should read 2500 psi (172 bar).

If the pressure is more or less than 2500 psi (172 bar), proceed to the next step.

Template Name: OML_2_col

Template Date: 1994_04_22