Template Name: OML_1_col Template Date: 1994_04_22
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844/642 Telehandler
HYDRAULICS
ATTACHMENT TILT CYLINDER TROUBLESHOOTING NOTE: If the tilt cylinder will roll back but not lower, replace the load counterbalance valve on the cylinder. Does the tilt operate without a load?
NO Follow the Control and Park Brake Pilot Pressure Troubleshooting procedure. Is the problem in the controls?
YES Test the pressure at the test port on MP on the. flow divider. Retract the boom to the end of the cylinder stroke and hold. Does the pressure gauge read 3000 psi (207 bar)?
YES Repair or replace the control components.
YES Use an in-line pressure gauge to test the roll tilt up at the tilt cylinder. Does the pressure gauge read 3000 psi (207 bar)?
YES Repair or replace the tilt cylinder.
NO Adjust the tilt pressure relief valve in the tilt control valve and retest the tilt up. Does the gauge read 3000 psi (207 bar)?
YES If the tilt does not work after adjusting the tilt relief valve, repair or replace the tilt cylinder.
NO Repair or replace the tilt control valve and/or the tilt relief valve. NO Use an in-line flowmeter to test the pressure at the EF port of the priority flow divider. Does the pressure gauge read 3000 psi (207 bar)?
YES Adjust the relief valve in the Main Control Valve. Open the load control valve of the flowmeter and hold the joystick in the boom lower position. Does the gauge read 3000 psi (207 bar)?
YES Remove the flowmeter.
NO Remove and bench test the hydraulic pump. Does the hydraulic pump meet specifications?
NO Replace the relief valve in the Main Control Valve. NO Repair or replace the hydraulic pump.
YES Repair or replace the priority flow divider.
PRINTED IN U.S.A.
601-7
913250
