Test Procedure For Ddc20 Pump - HUSTLER Super Z HD General Service Manual

Test Procedure for DDC20 Pump

Equipment required
Hustler Pressure Test Gauge Kit, part number
007898
Pump test procedure:
WARNING
This procedure will require that the unit to be raised and
blocked up off of the ground. It is necessary for the
wheels to rotate without coming in contact with the floor
or any object that would permit the unit to propel itself.
Stay clear and exercise caution when rotating wheels to
prevent injury. Use only appropriate vehicle stands, with
a minimum weight rating of 2000 pounds to block the
unit up. Use in pairs only. Follow the instructions sup-
plied with the vehicle stands.
WARNING
Untrained service personnel should never attempt to
make any adjustments or repairs to the mower's drive
system while the engine is running. The following proce-
dures should be performed by trained service person-
nel only.
The drive system of this mower consists of two independent
pump/motor combinations and will need to be tested separately.
The oil supply (reservoir), filtering system (located in the
bottom of the reservoir) and oil cooler are shared between the
two independent systems. The testing sequence below is testing
the hydrostatic pumps (only). If the test shows satisfactory
results but performance is still deemed unacceptable, the
motors, filtering, oil cooler and reservoir should be inspected.
1. Raise the rear of the mower and block with certified jack
stands. The rear wheels need to be able to rotate freely
and clear of all obstructions.
2. Chock the front tires.
3. Raise the seat platform and disconnect the mower harness
from the seat switch. Bypass the seat switch by
connecting the two mower harness female spades
together.
NOTE: There are two different seat options available for
this mower. On one seat you will disconnect the mower
harness directly from the seat switch as shown in Figure
4-18. On the other seat you will disconnect the wire
harness from the two connectors as shown in Figure 4-19.
NOTE: Remove the tire and wheel assembly.
4. Clean hydraulic oil lines connecting to motor thoroughly.
(Contamination allowed to enter in the hydrostatic
system can cause pump and motor failures)
5. After cleaning, remove oil supply lines from the motor
and loosen supply lines at the pump. One wheel motor
fitting may need to be removed to assist with test line
installation. Cap the wheel motor ports or fittings.
117592
Mower
harness
Mower
harness
6. Test procedures are the same for both the right and left
sides.
7. Install Hustler Test Gauge Kit (p/n 007898) as shown in
Figure 4-20 and Figure 4-21. Check the bypass valve
(tow valve) to make sure it is fully seated. Figure 4-22
8. Recheck hose and fittings to ensure they are tight.
9. Check oil reservoir for proper oil level and make sure
hydraulic filter is in good condition.
Hydraulic fluid escaping under pressure may have
sufficient force to penetrate skin and cause serious
injury. Foreign fluid injected into the skin must be
surgically removed within a few hours by a doctor,
familiar with this form of injury, or gangrene may
result.
4-7
Seat
switch
Female
spades
Figure 4-18
Female
spades
Figure 4-19
WARNING
REV C