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
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
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
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.
Maintenance Section |
© 2011 Alamo Group Inc.
MAINTENANCE
