TRUCK SERVICE MANUAL
4. Check system over for external leakage.
PRESSURE CHECKING THE POWER
Leakage is usually indicated by an oilwetted
STEERING PUMP SYSTEM
area, oil dripping or oily dirt accumulation. Since
air and fan draft have probably spread leaking
To check the hydraulic system, we use a pressure
oil, clean the entire system off thoroughly, then
gauge and high pressure shutoff valve. Here is the
operate and watch for leakage. Usual points for
specially designed testing equipment. Use standard
leaks are around fittings or along hoses which
hydraulic hose con
.,/ nections with the testing
have burst or split under stress and strain.
Leakage can cause the same troubles as a low
oil supply in the reservoir and a "lump" or hard
spot in steering. Air occasionally causes shimmy
The special equipment as shown in Fig. 18 is
designated as SE-1985 and consists of the following:
D. The third step is to check pump pressure.
90 Angle Tube Line Assembly
Inverted Flared Cap
First check the entire system for pressure, then the
components to isolate a malfunction.
1. Insert the pressure gauge and shutoff valve
between the pump and control valve, as shown
in Fig. 19.
Fig. 18 Special Testing Equipment
Fig. 19 Pressure Gauge Installed in System