TESTING AND ADJUSTING
Do not disconnect an oil line from a check valve until
When the setting of a relief valve is too low, the oil to
the hydraulic cylinder is in a position where there is low
one end of the steering cylinders can go through the
or no oil pressure in the cylinder. Put the blade and
relief valve, into the oil from the other end of the steering
ripper on the ground and install the lock pin in the tie bar
for the wheel lean, then, stop the engine.
Remove plugs (3), springs (4) and balls (6). Put a
metal rod [1/4 in. (6.4 mm) diameter and 4 in. (101.6
mm) long] through seat (7) and against piston (5). Use a
small hammer on the rod and the piston will move one of
the seats out of the valve body. Use the small hammer
and a metal rod [11/16 in. (17.5 mm) diameter and 6 in.
(152.4 mm) long] to remove the other seat. If the lock
check valve has outlet chokes, remove fittings (2) and
outlet chokes (1).
Clean and inspect the parts for damage. Install new
O-ring seals on plugs (3).
Install piston (5) and both seats (7). Use the small
hammer and 11/16 in. (17.5 mm) rod on the seats to get
them into the valve body.
Install balls (6), springs (4) and plugs (3). Torque for
plugs (3) is 25 5 Ib.ft. (3.5 0.7 mkg). Install outlet
DUAL CROSSOVER RELIEF VALVE FOR STEERING
1. Right side valve.
chokes (I). The torque for fittings (2) is 55 5 lb.ft. (7.6
The pressure setting for each 3G7448 relief valve is
2372 29 psi (I 16.8 2.0 kg/cm2), with an oil flow of 5
DUAL CROSSOVER RELIEF VALVE
0.3 U.S. gpm (19 1 litre/min). One 5J4857 shim will
change the pressure setting approximately 170 psi
If the steering wheel moves the wheels too slow in
either or both directions, or does not move the wheels
NOTE: To add or remove shims in the 3G7448 relief
when the steering wheel is turned, the relief valve can be
valve, the valve must be disassembled.