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MAINTENANCE
INTERSTATER 02/11 Maintenance Section 5-24
© 2011 Alamo Group Inc.
MAINTENANCE
Checking Relief Valve Pressure
1. To check the relief valve pressure setting, remove inlet hose at the control valve. Install a tee fitting and
reconnect the hose to a pressure gauge.
2. Check for proper tension on front drive belts (1/4 inch play at midpoint).
3. Start engine and run at low idle.
4. Raise the Tilt cylinder and note the pressure when the cylinder bottoms.
5. The pressure should be the same on both circuits, 1200 psi. If the pressure is 1200 psi on one and not on
the other, the relief valve and the pump are working fine. The problem would be somewhere else.
6. If pressure is low on both circuits, adjust relief valve. Remove hex cap, loosen lock nut (if present) and turn
adjusting screw clockwise.
7. If the pressure does not increase, remove the relief valve and inspect it. If the valve is good, the gear pump
is worn.