PRINTED IN U.S.A.
601-7
913241/BP0508
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Template Name: OML_1_col
0-00000
Template Date: 1994_04_22
RS5/6-34 Telescopic Handler
HYDRAULICS
BOOM EXTEND CYLINDER TROUBLESHOOTING
NOTE:
If the extend cylinder will extend but will not retract or retracts slowly, repair or replace the counter balance
valve on the cylinder.
Does the boom extend without a capacity load?
Test the pressure at the MP test port on the
Follow the Control and Park Brake Pilot Pres-
flow divider. Lower the boom to the end of the
sure Troubleshooting procedure. Is the problem
cylinder stroke and hold. Does the pressure
in the controls?
gauge read 3000 psi (207 bar)?
Repair or replace the malfunction-
ing control components.
Use an in-line pressure gauge to test the
extend pressure at the extend cylinder. Does
the pressure gauge read 2500 psi (172 bar)?
Repair or replace the extend cylinder.
Adjust the extend pressure relief
valve in the control valve and retest
the extend pressure. Does the gauge
read 2500 psi (172 bar)?
If the extend/retract does not work after
Repair or replace the extend control
adjusting the relief valve, repair or replace
valve and/or the extend relief valve.
the extend cylinder.
Use an in-line flowmeter to test the pressure at
the EF port of the flow divider. Does the
pressure gauge read 3000 psi (207 bar)?
Adjust the relief valve in the Main Control Valve.
Remove and bench test the hydraulic pump.
Open the load control valve of the flowmeter and
Does the pump meet specifications?
hold the joystick in the boom lower position.
Does the gauge read 3000 psi (207 bar)?
Remove the flowmeter.
Replace the relief valve in
the Main Control Valve.
Repair or replace the
Repair or replace the hydraulic pump.
flow divider.
YES
NO
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