844/642 Telehandler HYDRAULICS

Shut off the engine. Remove the cover from the counterbalance valve.

NOTE: The cover is friction fit and can be loosened by twisting the cover on the valve cartridge.

Loosen the locknut (1) and turn the adjusting screw (2) counterclockwise to increase and clockwise to decrease the counterbalance release pressure.

NOTE: One turn of the adjusting screw will change the pressure approximately 500 psi (35 bar).

Hold the adjusting screw from turning and tighten the locknut. Repeat Steps 59 and 60 until the pressure gauge reads 1500 psi (103 bar).

If the adjusting screw does not change the pressure, replace the counterbalance valve cartridge.

Template Name: OML_2_col

Template Date: 1994_04_22

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844/642 Telehandler HYDRAULICS

Frame Leveling Cylinder Quick Test

STEP 61

Install a 5000 psi pressure gauge and hose on the SP test port of Pump 2.

NOTE: The hose must be long enough to observe the pressure gauge from inside the cab or standing clear of the fork lift.

STEP 62

Start the engine and run at 1000 RPM. Tilt the frame to the right until the frame leveling cylinder reaches the end of its stroke and hold. The pressure gauge should read 2500 psi (172 bar).

If the pressure is less than 2500 psi (172 bar), proceed to Step 63.

If the pressure is 2500 psi (172 bar), but the frame leveling does not work properly, go to the Frame Leveling Counterbalance Valve Test.

If the pressure is more than 2500 psi (172 bar), replace the flow divider.

STEP 63

Turn the steering wheel until the wheels reach their travel limits and hold. The pressure gauge should read 2500 psi (172 bar).

If the pressure is less than 2500 psi (172 bar), to the Pump Pressure Test.

If the pressure is 2500 psi (172 bar), proceed to Step 64.

Frame Leveling Cylinder Direct Test

STEP 64

Shut off the engine. Remove the hose (1) from the rod end (tilt right) port (2) of the leveling cylinder. Install a hose and a 5000 psi (345 bar) pressure gauge (3) between the hose (1) and port (2).

STEP 65

Start the engine and run at 1000 RPM. Hold the frame leveling joystick in the TILT RIGHT position. The pressure gauge should read 2500 psi (172 bar).

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

Template Name: OML_2_col

Template Date: 1994_04_22