SECTION 9
STEERING
disasssembly of the relief valve is required, follow these
9-63. The flow divider is mounted on the front, right-
steps:
hand side of the engine compartment. Four hoses are
routed to and from the flow divider. The unit consists of a
(1) Remove the spring loaded end cap and
body, a pressure-compensated piston and a pilot
remove the spring and pin.
operated relief valve.
(2) Push the piston out of the housing by
9-64. Port "P" is for the pump supply hose. Port "CF" is
inserting a small drift into the hose end of the housing.
for controlled flow and is connected to the steering control
Removal of piston may be difficult because the o-ring has
unit at the gooseneck. Port "EF" is for excess flow and is
to slide past threads.
connected to the inlet fitting of the pump. Port "S" is for
relief flow and is connected to the outlet fitting in the
9-71.
CLEANING AND INSPECTION.
hydraulic tank.
a. Clean all parts thoroughly.
9-65.
OPERATION (see figure 9-92).
b. Check bores and spools for nicks and scratches.
9-66. At low pump speed, with input flow equal or less
Spools must slide freely in their bores.
than set controlled flow, all flow is directed to the
controlled flow "CF" port. The pressure-compensating
c. Ports and orifices must be free of obstructions.
pistons prevent or block any flow to the excess flow
port. Controlled flow in this situation may be used up to
9-72. REASSEMBLY AND INSTALLATION OF FLOW
the full integral relief valve pressure, however, the rate
DIVIDER (see figures 9-1 and 9-92).
of controlled flow will decrease if the input flow decreases.
CAUTION: Replace and oil all o-rings.
9-67. When input flow is increased, the pressure-
compensated piston, in maintaining a fixed pressure drop
a. Insert the relief piston into the relief valve
across the orifice, moves further away from its stop
housing. Insert the pin into the piston (the short side goes
position to allow fluid to flow from the input port to the
excess flow "EF" port in maintaining the set controlled
into the piston) and the spring. Screw the end cap into
relief valve housing.
flow.
b. Screw the relief valve housing assembly into the
9-68. The pilot operated relief valve is factory set to
1500 50 PSI (105.5 3.5 kg/cm") and cannot be
flow divider.
adjusted. This valve relieves excessive pressures due to
c. Install the piston, spring and cap.
shock loads or other causes.
d. Install the mounting capscrews.
9-69.
REMOVAL OF FLOW DIVIDER (see figure 9-1 .)
e. Connect the hydraulic lines.
a. Remove all hydraulic lines from the flow divider
and cap all openings.
9-73. ADJUSTMENT OF FLOW D IVIDER RELIEF
VALVE.
b. Unscrew mounting capscrews and remove flow
divider from mounting bracket.
9-74. The relief valve is factory set at 1500 50 PSI
(105.5 3.5 kg/cm2). Do not try to adjust or repair the
9-70. DISASSEMBLY OF FLOW DIVIDER (see figure
relief valve, but replace the whole valve.
9-75.
STEERING CYLINDER.
CAUTION: The piston end cap is spring loaded.
9-76.
DESCRIPTION (see figure 9-93).
a. Remove end cap, spring and piston.
9-77. The steering cylinder is a double-acting cylinder
b. Remove relief valve assembly.
If further
consisting primarily of a shell, piston and rod assembly
and two end plugs. Hydraulic oil applied to one of the
cylinder ports acts against the piston, causing piston and
9-27.
