605046 4-3 REV A
Master in-line fuse
These mowers have a master in-line fuse in the electrical
system. This is the main fuse to protect the complete electrical
system. It is located under the seat platform and next to the
solenoid. Figure 4-1
Hydraulic System
This mower is equipped with two integrated hydrostatic
transmissions. Figure 4-2
IMPORTANT: Never use hydraulic or automatic transmis-
sion fluid in this system; use only motor oil as specified.
Remember, dirt is the primary enemy of any hydraulic system.
The hydraulic expansion tank is located in front of the engine
and under the operator’s platform. Figure 4-2
Check oil level in hydraulic system after every 50 hours of
operation or weekly, whichever occurs first. Check more often if
system appears to be leaking or otherwise malfunctioning.
Fluid level should be at the “Full Cold” line on the expansion
tank. Use only SAE 20W50 SL/SM service motor oil.
Initial system oil and filter change must be after the first 75
hours of use or 1 year whichever comes first. Thereafter, replace
filter and oil in each transmission every 2 years or 200 hours,
whichever comes first. NOTE: The filter guard must be
removed to access filter.
Each transmission’s filter is located per Figure 4-3. A
standard oil filter wrench is used to change filter, threads are
right handed. Use a BigDog
®
Mowers approved filter element
only.
Shorts caused by battery terminals or metal tools touch-
ing metal mower components can cause sparks. Sparks
can cause a battery gas explosion which will result in per-
sonal injury.
• Prevent the battery terminals from touching any
metal mower parts when removing or installing the
battery.
• Do not allow metal tools to short between the bat-
tery terminals and metal mower parts.
Incorrect battery cable routing could cause damage to the
mower and battery cables. This can cause sparks which
can cause a battery gas explosion which will result in per-
sonal injury.
•Always disconnect the negative (black) battery
cable(s) before disconnecting the positive (red)
cable(s).
•Always connect the positive (red) battery cable(s)
before connecting the negative (black) cable(s).
Figure 4-1
When washing the mower, direct the spray away (espe-
cially if using a power washer) from the transmission’s
seals to prevent water intrusion and to ensure component
performance
Figure 4-2
Figure 4-3
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