Vehicle System Testing and Adjusting 66
Steering System Pressure Check
If the steering system does not work correctly, check
the hydraulic tank for the correct oil level and the
hoses and connections for leakage. If all these items
are correct, use the Pressure Gauge Kit to check the
steering hydraulic system and its relief pressure
setting.
Hydraulic Steering Gear
(1) Elbow (Pressure line from priority valve).
WARNING
Hydraulic pressure can cause personal injury.
Before any hydraulic lines or steering system
components are disconnected, make sure all
hydraulic pressure is released in the steering
system. Move the steer wheels to the left and
right and then, to the straight forward direction.
Check steering system relief pressure as follows:
1. Turn the engine off.
2. Remove the plug from elbow (1) Install pressure-
checking adapter (4) and connect pressure-tube
(5) and pressure gage (6). Pressure gage (6) has
a range of 2800 kPa (4000psi).
3. Move the seat to the normal position for operation,
start the engine and activate the hydraulic controls
until the oil is at a temperature for normal
operation.
4. Turn the steer wheels to the left or right against
the stops and make a note of the indication on the
pressure gauge.
5. The indication on the pressure gauge must be the
priority valve relief setting of 9,000 +0 /+300 kPa
(1,305 +0 /+43 psi). If the indication is correct and
a problem exists, then there is possibly a
mechanical failure in the steering system.
6. If the indication is not correct, then there is
steering hydraulic failure in the components.
(4) Pressure-Checking Adapter. (5) Pressure-Tube.
(6) Pressure Gauge.
a. With the engine running, turn the steer wheels
in any directions and read the indication on
pressure gauge (6).
b. If the indication is approximately the pressure
shown in Step 5, then the steering gear is
normal.
c. If the indication is too low or too high, then the
priority valve in the control valve or its
components must be replaced.
7. If the steering gear and the priority valve are
working properly, the steering cylinder is defective
and must be repaired.
8. Correct the problem and check steering relief
valve pressure again.
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