Procedure for Steering Pump Flow and Relief Pres-
sure Test:
9. To test steering pump relief pressure:
A. Make sure flow control valve on tester is fully
open.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
B. Start engine and depress accelerator pedal so
engine is running at high idle (3375 + 25 RPM).
2.
tem off. Apply parking brake and make sure range selec-
tor is in the neutral position.
Park machine on a level surface with the spray sys-
IMPORTANT: Hold steering wheel at full lock
only long enough to get a system pressure read-
ing. Holding the steering wheel against the stop
for an extended period will damage the steering
motor.
3.
4.
Read Precautions For Hydraulic Testing.
Make sure that steering pump drive belt is adjusted
properly. (see Operator’s Manual).
C. Watch pressure gauge carefully while turning the
steering wheel completely in one direction (full steer-
ing lock) and holding.
CAUTION
D. System pressure should be approximately 1000
PSI as the relief valve lifts. Return steering wheel to
the center position.
Rotate steering wheel with engine off to relieve
system pressure and avoid injury from pressur-
ized hydraulic oil.
E. Release accelerator pedal and turn off machine.
Record test results.
5.
from the top of the steering pump (Fig. 11).
Clean hose fitting and disconnect pressure hose
10.If relief pressure is incorrect, inspect for:
A. Slipping pump drive belt.
IMPORTANT: Make sure oil flow indicator arrow on
the flow gauge is showing that the oil will flow from
the pump through the tester and into the hose.
B. Worn, stuck, or out of adjustment relief valve.
11.
Disconnect tester from steering pump and hose. Re-
6.
Install flow tester with pressure gauges in series with
connect hose to the pump.
the pump and the disconnected hose. Make sure flow
control valve on tester is fully open.
2
7.
To test steering pump flow:
A. Start engine and adjust engine speed with accel-
erator pedal so pump speed is 3450 RPM (engine
speed approximately 3000 RPM). Verify pump
speed with a phototac.
B. Close flow control valve on tester until pressure
gauge reads 800 PSI. Observe flow gauge.
TESTER READING: Flow approximately 2.7 GPM.
1
C. Release accelerator pedal and turn off machine.
Record test result.
FRONT
8.
If pump flow specification is not met, inspect for:
A. Slipping pump drive belt.
3
Figure 11
B. Worn, stuck, or out of adjustment relief valve.
C. Pump suction line restriction.
1.
2.
Steering pump
Pressure hose
3.
Suction hose
D. Steering pump needs to be repaired or replaced.
Multi Pro 1200/1250
Page 4 – 13
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Multi Pro 1200, Toro Multi Pro 1250 |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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