TM 5-3805-263-14&P-3
HYDRAULIC SYSTEM
AND STEERING
(128.3 1.8 kg/cm2). Add or remove shims (14) to
METERING VALVE FOR STEERING
get the correct pressure setting.
If the steering wheel moves the wheels too slow in
either or both directions, or does not move the wheels
when the steering wheel is turned, there is either a part
with damage, or there is dirt in the metering valve for
steering.
There is no adjustment for the metering valve. It
must be disassembled to find the cause.
TESTING THE STEERING CIRCUIT
Dual Crossover Relief Valve Check
If the steering wheel moves the front wheels too
If the steering pressure reducing valve (15) is
slowly or does not move them at all, check the pressure
adjusted correctly and the front wheels still do not steer
at the steering pressure reducing valve (15) and the dual
or steer slowly, check the steering pressure at the dual
crossover relief valves (2) and (3).
crossover relief valves as follows.
To make a check of the dual crossover relief valves
1. Remove plug (7) from crossover relief valve (2)
(2) and (3) and the steering metering pump (6), the
and install the same gauge that was used in the
pressure at the steering pressure reducing valve (15)
previous test of the steering pressure reducing
must be checked first.
valve.
NOTE: There can be no pressure difference between
2. Start the engine and operate the implements until
the dual crossover relief valves or between the steering
the oil temperature gets to 150 5 F (65 5 C).
pressure reducing valve and the dual crossover relief
3. Increase the engine rpm to Hi Idle.
valves. Use the same gauge to check each valve.
4. Turn the steering wheel (1) to the left
(counterclockwise) until the wheels are against the
Steering Pressure Reducing Valve Check
stops. Hold the steering wheel and read the
pressure on the gauge. It must be 1825 25 psi
To check and adjust the steering pressure reducing
2
(128.3 1.8 kg/cm ).
valve (15), do the following.
5. Remove plug (4) from crossover relief valve (3)
1. Remove plug (16) and install the 7S8712 gauge
and install the same pressure gauge. Install plug
from the 5S5123 Hydraulic Test Group or the
(7). Turn the steering wheel to the right (clockwise
7S8714 gauge from the 5P5224 Hydraulic Test
until the wheels are against the stops). Hold the
Group.
steering wheel and read the pressure on the
gauge. It must be 1825 25 psi (128.3 1.8
2. Start the engine and operate the implements to
2
kg/cm ).
raise the temperature of the hydraulic oil to 150
NOTE: If the steering wheel continues to turn after
5 F (65 5 C).
hitting the stops, it is an indication of a low crossover
relief setting or badly damaged valve seat.
3. Increase the engine rpm to Hi Idle. The pressure
reading on the gauge must be 1825 25 psi
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