REV A 4-6 121536
6. Locate the tension idler spring. Securely clamp locking
pliers onto the spring at the end located next to the
idler arm. Figure 4-10
7. Release the transaxle drive belt tension, using the
locking pliers, to remove the tension spring from the
idler arm. Swing the idler arm out of the way.
Figure 4-13
8. Remove the transaxle drive belt from the transaxle
drive pulleys and the engine pulley. Figure 4-13
9. Replace the transaxle drive belt and route it around the
engine pulley and the transaxle drive pulleys.
Figure 4-13
10. Make sure the transaxle drive belt is routed correctly
around the tension idler before attaching the tension
spring. Using the locking pliers, re-attach the tension
spring to the idler arm to re-tension the transaxle drive
belt. Remove the locking pliers from the tension
spring. Figure 4-13
11. Reroute the deck drive belt around the electric clutch
pulley. Make certain the belt is routed properly around
the spindle pulleys and stationary idler pulley(s). Re-
tension the deck drive belt by pulling on the deck belt
idler spring and hooking it in the spring mount on the
deck. Figure 4-10, Figure 4-11 & Figure 4-12
12. Raise the rear of the mower and remove the jack
stands.
13. Lower the mower.
14. Re-attach the negative battery cable.
Hydraulic System
This mower is equipped with two integrated hydrostatic
transmissions. Figure 4-14
IMPORTANT: Never use hydraulic or automatic transmis-
sion fluid in this system; use only the specified motor oil.
Remember, dirt is the primary enemy of any hydraulic sys-
tem.
The hydraulic expansion tank is located to the left of the
engine. Figure 4-14
Check the oil level in the hydraulic system after every 50
hours of operation or weekly, whichever occurs first. Check
more often if the system appears to be leaking or otherwise
malfunctioning.
Fluid level should be at the “Full Cold” line on the expan-
sion tank. Use only SAE 20W50 service motor oil.
Initial system oil and filter change must be after the first 75
hours of use or one (1) year whichever comes first. Thereaf-
ter, replace filter and oil in each transmission every two (2)
years or 200 hours, whichever comes first. NOTE: The filter
guard must be removed to access the filter. Figure 4-15
Each transmission’s filter is located per Figure 4-15. A
standard oil filter wrench is used to change filter, threads are
right handed. Use a Big Dog
®
Mowers approved filter element
only.
IMPORTANT: When washing the mower, direct the spray
away (especially if using a power washer) from the transmis-
sion’s seals to prevent water intrusion and to ensure compo-
nent performance.
Fluid changing procedure
1. Park the unit on a level surface.
• Place the steering control levers in the park brake
position.
• Disengage the deck clutch.
A. Tension idler spring
B. Transaxle drive belt
C. Idler arm
Figure 4-13
B
A
C
A. Expansion tank
Figure 4-14
A
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