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Procedure for Steering Pump Flow and Relief Pressure<br />
Test:<br />
1. Make sure hydraulic oil is at normal operating temperature<br />
by operating the machine for approximately 10<br />
minutes.<br />
2. Park machine on a level surface with the spray system<br />
off. Apply parking brake and make sure range selector<br />
is in the neutral position.<br />
3. Read Pre<strong>caution</strong>s For Hydraulic Testing.<br />
4. Make sure that steering pump drive belt is adjusted<br />
properly. (see Operator’s Manual).<br />
CAUTION<br />
Rotate steering wheel with engine off to relieve<br />
system pressure and avoid injury from pressurized<br />
hydraulic oil.<br />
5. Clean hose fitting and disconnect pressure hose<br />
from the top of the steering pump (Fig. 11).<br />
IMPORTANT: Make sure oil flow indicator arrow on<br />
the flow gauge is showing that the oil will flow from<br />
the pump through the tester and into the hose.<br />
6. Install flow tester with pressure gauges in series with<br />
the pump and the disconnected hose. Make sure flow<br />
control valve on tester is fully open.<br />
7. To test steering pump flow:<br />
A. Start engine and adjust engine speed with accelerator<br />
pedal so pump speed is 3450 RPM (engine<br />
speed approximately 3000 RPM). Verify pump<br />
speed with a phototac.<br />
B. Close flow control valve on tester until pressure<br />
gauge reads 800 PSI. Observe flow gauge.<br />
TESTER READING: Flow approximately 2.7 GPM.<br />
C. Release accelerator pedal and turn off machine.<br />
Record test result.<br />
8. If pump flow specification is not met, inspect for:<br />
A. Slipping pump drive belt.<br />
B. Worn, stuck, or out of adjustment relief valve.<br />
C. Pump suction line restriction.<br />
D. Steering pump needs to be repaired or replaced.<br />
9. To test steering pump relief pressure:<br />
A. Make sure flow control valve on tester is fully<br />
open.<br />
B. Start engine and depress accelerator pedal so<br />
engine is running at high idle (3375 + 25 RPM).<br />
IMPORTANT: Hold steering wheel at full lock<br />
only long enough to get a system pressure reading.<br />
Holding the steering wheel against the stop<br />
for an extended period will damage the steering<br />
motor.<br />
C. Watch pressure gauge carefully while turning the<br />
steering wheel completely in one direction (full steering<br />
lock) and holding.<br />
D. System pressure should be approximately 1000<br />
PSI as the relief valve lifts. Return steering wheel to<br />
the center position.<br />
E. Release accelerator pedal and turn off machine.<br />
Record test results.<br />
10.If relief pressure is incorrect, inspect for:<br />
A. Slipping pump drive belt.<br />
B. Worn, stuck, or out of adjustment relief valve.<br />
11. Disconnect tester from steering pump and hose. Reconnect<br />
hose to the pump.<br />
FRONT<br />
Figure 11<br />
1. Steering pump 3. Suction hose<br />
2. Pressure hose<br />
1<br />
3<br />
2<br />
Hydraulic<br />
System<br />
Multi Pro 1200/1250 Page 4 – 13 Hydraulic System
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