Cooling Fan Pump Flow Testing Procedure - Toro Z Master Z597 Service Manual

HYDRAULIC SYSTEM
7. Verify the restrictor valve on the hydraulic flow tester
is in the fully "Opened" position.
8. Start the machine. Run the unit for approximately 5
minutes to warm the oil in the hydrostatic system.
9. Release the parking brake and bring both levers to
the inside neutral position. Set the engine throttle to
full RPM.
10. Stroke the left hand hydrostatic lever fully forward.
Very slowly, rotate the "T" handle of the adjustable
flow tester restrictor valve until the pressure gauge
reaches 500 PSI (3447 kPa). The measured flow
should be between 13 to 15 gpm (49 to 56.8 lpm).
11. With the unit at full engine throttle speed, slowly
rotate the "T" handle of the flow tester restrictor
valve clockwise until the pressure gauge reads
approximately 1000 to 1200 PSI (6895 to 8274 kPa).
Caution: DO NOT operate the machine for an
extended period of time at the 1200 PSI
4
rate.
12. Record the difference or "flow droop" of the pump.
For the Hydro-Gear BDP 21 pump, maximum
allowable "flow droop" is 2.0 gpm (7.5 lpm). Any
droop greater than 2.0 gpm (7.5 lpm) is considered
unacceptable and the pump should be repaired/
replaced barring any other potential causes.
13. Return the motion control lever to neutral position
and return both levers to the neutral locked position.
Engage the parking brake. Slow the engine speed
to idle and turn the ignition switch to the OFF
position.
14. Disconnect the hydraulic flow tester from the
hydraulic lines.
15. Re-connect the hydraulic lines to the wheel motor.
Tighten the hydraulic lines to the wheel motor.
16. Check the hydraulic reservoir and fill as necessary to
the "Hot" level mark; refer to Figure 006, page 2-5.
17. Reinstall the left rear tire and lower the unit to the
ground. Remove the temporary jumper cable and
reconnect the seat switch. Reconnect the electric
PTO clutch.
4-30
Cooling Fan Pump Flow Testing
Procedure
1. Raise the seat and disconnect the seat switch plug
from the harness. Temporary install a jumper lead
into the harness.
2. Remove the muffler guard (Fig. 216).
Fig 216
3. Unlatch and open the hood.
4. Slide a low profile oil catch pan or absorbent cloth
pad under the fan motor and on top of the engine.
Z Master Z597 Diesel Service Manual
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