REV B 4-10 125816
(Caution: Do not hold steering control lever in rearward
position for more than 10 seconds as oil will become
extremely hot).
If pressure is less than 2600 PSI, causes are: internal
relief valve is faulty or internal pump parts are
damaged.
IMPORTANT: Anytime a hydraulic pump is replaced the
drive motor, hydraulic lines and oil cooler must be inspected
and cleaned or replaced due to possible contamination.
After testing is concluded:
1. IMPORTANT: With the engine off, disconnect the two
female spade connectors from each other (from step
#3) and reconnect them to the seat switch. This must
be completed so that the safety circuit is functioning
properly. Figure4-21
2. Remove the Hustler
®
Pressure Test Gauge Kit.
3. After all repairs are completed, check to make sure all
tools and obstructions are removed from under the
mower.
4. Raise the rear of the mower and remove the jack
stands. Lower the mower.
5. Lower and secure the seat platform.
New or Rebuilt DDC20 Pump Startup Procedure
NOTE: Use this startup procedure any time a DDC20 pump
has been removed for service or replaced.
Do not operate the mower without plugging the
mower’s wiring harness into the seat switch. This
switch is an important part of the safety start
interlock system. Serious injury can result if the
seat switch is not plugged into the mower’s wiring
harness.
Never operate the mower with a non-functioning
seat switch. Always reconnect the seat switch to the
mower harness.
A. Cap fitting B. Supply lines
Figure 4-22
Pressure test gauge kit shown installed
Figure 4-23
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