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MAINTENANCE
F-4139 01/11 Maintenance Section 3-7
© 2011 Alamo Group Inc.
MAINTENANCE
VALVE SERVICE
Top of valve is defined as side where joysticks are
installed.
Before servicing valve, make sure backhoe has boom
locked, stabilizers locked, and dipper in down position.
Shut off tractor and relieve pressure by activating valve
handles. Use a drip pan below backhoe to catch any
escaping oil during removal of valve.
WARNING: Failure to lock booms and
stabilizer and relieve pressure in valve can
cause serious injury from equipment falling
when hydraulic pressure is released by the
removal of valve.
MAIN RELIEF REPLACEMENT
1. Use a socket to remove main relief from valve
housing.
2. Inspect new relief to ensure seal is properly installed,
and apply grease around the relief.
3. Ensure that pressure setting stamped on new relief
matches the setting of old relief.
4. Install o-rings on relief.
5. Insert relief and torque to 60 ft./lbs.
SPOOL SEAL INSTALLATION
1. Remove the mechanical joystick kit from the top of the
valve and the return kit from the bottom.
2. Remove the old o-rings and leave spool in housing,
making sure spool is in center position.
3. Lightly oil one seal and insert it in top of valve. Slide
the seal into position in the groove in the valve body,
making sure that it does not fall into the spool groove.
4. Lightly oil a second o-ring and insert in bottom of
valve. Slide the seal into position in the groove in the
valve body making sure it does not fall into the spool
groove. Do not push on the spool as it may cause the
first seal to come out of the groove.
WARNING: If either of the seals falls in the
spool groove, it may be cut when the spool
moves. If this happens, make sure to gently
remove the seal from the groove, and
reposition seal after inspecting for cuts in the
housing groove once the spool is back in
center position.
5. Reinstall the mechanical joystick kit on the top of the
valve and return kit on the bottom.
TORQUE SETTINGS
1. Main Relief Body: 60 ft./lbs.
2. Load Check Valve: 15 ft./lbs.
3. Screws: 4 ft./lbs.