117364 4-9 REV B
10. Run engine at mid throttle for one or two minutes or until
top of pump is warm to the touch.
11. Increase engine speed to full throttle.
12. Slowly move the steering control lever forward. You
should easily get a 2600 PSI reading from one of the
gauges. Return steering control lever to neutral.
(Caution: Do not hold steering control lever in forward
position for more than 10 seconds as oil will become
extremely hot).
Then, slowly move steering control lever in reverse. You
should easily get a 2600 PSI reading from the other
gauge. (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 contami-
nation.
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. Figure 4-22 & Figure 4-23
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.
New or Rebuilt DDC20 Pump Startup
Procedure
NOTE: Use this startup procedure any time a DDC20 pump
has been removed for service or replaced.
Before applying pressure to hydraulic system, make
sure all connections are tight and all hoses and lines
are in good condition. To find a leak under pressure,
use a piece of cardboard or wood — never use your
hands. Relieve all pressure in the system before dis-
connecting or working on hydraulic lines. To relieve
pressure, lower all attachments and shut off engine.
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.
Figure 4-24
Figure 4-25
Pressure Test Gauge Kit
shown installed
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