122832 4-5 REV A
Hydraulic System
IMPORTANT: Never use hydraulic or automatic transmis-
sion fluid in this system; use only synthetic motor oil as
specified. Remember, dirt is the primary enemy of any
hydraulic system.
Check oil level in hydraulic system after every 50 hours of
operation or weekly, whichever occurs first. The hydraulic
system must be cool when checking the oil level and the
mower should be on level ground. Check more often if sys-
tem appears to be leaking or otherwise malfunctioning.
Use the hydraulic reservoir’s sight glass to check the reser-
voir fluid level. The oil level should be approximately in the
middle of the sight glass. Figure 4-9
Only use full synthetic 15W50 oil in the hydraulic system.
NOTE: The reservoir (Figure 4-10) will require approxi-
mately 1.0 U.S. gallons (3.78 liters) of full synthetic 15W50
oil when replacing the oil after an oil and filter change. Do not
overfill the reservoir.
Initial system oil and filter change must be after the first 50
hours of mower operation. Thereafter, replace filter and oil in
the reservoir annually or every 500 hours, whichever comes
first.
IMPORTANT: It is necessary to drain the system oil from
the hydraulic reservoir, using the reservoir drain plug, before
removing the hydraulic filter. Replace the drain plug before
adding system oil.
The system filter is located at the left rear of the engine.
Use a Big Dog
®
approved filter element only. When changing
the filter use a standard oil filter wrench. The threads are
right hand. Figure 4-11
IMPORTANT: Pre-fill the filter element with clean oil
before installing, to prevent drawing air into the system
pump.
Hydraulic Pump Flow Test
The design purpose of the Bi-Directional Flow Test Kit is to
allow the technician to isolate the pump from the wheel
motor and determine if the pump is acceptable. The follow-
A. Transmission drive belt
B. Tension spring
C. Eyebolt
D. Nut
E. Jam nut
F. 7.80” ± .125”
(198.12mm ± 3.18mm)
Figure 4-8
Hydraulic fluid escaping under pressure may have
sufficient force to penetrate skin and cause seri-
ous injury. Foreign fluid injected into the skin must
be surgically removed within a few hours by a doc-
tor, familiar with this form of injury, or gangrene
may result.
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 disconnecting or working on
hydraulic lines. To relieve pressure, lower all
attachments and shut off engine.
A. Sight glass
Figure 4-9
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