Toro Multi Pro 1200 Service Manual page 51

Procedure for Steering Pump Flow and Relief Pres-
sure Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Park machine on a level surface with the spray sys-
tem off. Apply parking brake and make sure range selec-
tor is in the neutral position.
3. Read Precautions For Hydraulic Testing.
4. Make sure that steering pump drive belt is adjusted
properly (see Operator's Manual).
CAUTION
Before disconnecting components or perform-
ing any work on hydraulic system, all pressure in
the system must be relieved by stopping the en-
gine and rotating the steering wheel in both
directions.
5. Clean hose fitting and disconnect pressure hose
from the top of the steering pump (Fig. 14).
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.
6. Install flow tester with pressure gauges in series with
the pump and the disconnected hose. Make sure flow
control valve on tester is fully open.
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 (55 bar). Observe flow gauge.
TESTER READING: Flow approximately 2.7 GPM.
C. Release accelerator pedal and turn off machine.
Record test result.
8. If pump flow specification is not met, inspect for:
A. Slipping steering pump drive belt.
B. Worn, stuck or out of adjustment relief valve.
C. Pump suction line restriction.
D. Steering pump needs to be repaired or replaced.
Multi Pro 1200/1250
9. To test steering pump relief pressure:
A. Make sure flow control valve on tester is fully
open.
B. Start engine and depress accelerator pedal so
engine is running at high idle (3275 to 3425 RPM).
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 may damage the steering
control valve.
C. Watch pressure gauge carefully while turning the
steering wheel completely in one direction (full steer-
ing lock) and holding.
D. System pressure should be approximately 1000
PSI (69 bar) as the relief valve lifts. Return steering
wheel to the center position.
E. Release accelerator pedal and turn off machine.
Record test results.
10.If relief pressure is incorrect, inspect for:
A. Slipping steering pump drive belt.
B. Worn, stuck or out of adjustment relief valve in
steering pump.
11. After testing is completed, disconnect tester from
steering pump and hose. Reconnect hose to the pump.
FRONT
1. Steering pump
2. Pressure hose
Page 4 - - 15
2
1
3
Figure 14
3. Suction hose
Hydraulic System