CONTROL VALVE ASSEMBLY 1740334 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.
Refer to the Testing and Adjusting, "Machine Prepartation for Troubleshooting" section.Note: Make sure that the cushion-hitch accumulator is correctly charged with dry nitrogen gas before adjusting the linkage for the leveling stem.
Start the engine. Operate the engine at low idle.
Move the switch for the cushion-hitch to the CUSHION RIDE position.
Illustration 1 g00662888
(1) Leveling valve (2) Valve stem (3) Yoke (4) Retainer (5) Locknut (6) Pin
Illustration 2 g00662895
(1) Leveling Valve (A) Extension of the load cylinder in the CUSHION RIDE position
Allow rod of load cylinder to extend as far as possible. Measure the rod for extension (A). This distance (A) is defined as the extension of rod. This distance (A) should be 121 6 mm (4.8 .2 inch).
In order to adjust the extension of rod, loosen locknut (5). Pull down on the retainer (4). Remove the pin (6) in yoke (3). Turn yoke (3) until the extension (A) of rod is 121 6 mm (4.8 .2 inch).
Do not rotate the leveling stem (2) in leveling valve (1) .
Reinstall the pin (6) in yoke (3). Position pin (6) at an angle that is 90° from the centerline of the machine.
Push up on the retainer (4) into position. Hold the leveling stem (2) while you are tightening locknut (5) .
Move the switch for the cushion-hitch to the LOCKDOWN position. When rod of load cylinder has fully retracted, move the switch for the cushion-hitch to the CUSHION RIDE position.
Repeat this procedure several times in order to make sure that the linkage for the leveling stem has been adjusted correctly.