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Troubleshooting, Adjustment & Service
TRANSMISSION MAINTENANCE
AND SERVICE
The hydrostatic transmissions are sealed units that
require no maintenance other than the following.
• Keep the grass screen and transmission cooling fins
clear or grass, leaves and debris.
• Keep oil level in the reservoirs (A, Figure 30) at the
“FULL” line (B, Figure 30). Extra oil in the reservoir
will not benefit the machine.
• If it is necessary to add oil to the reservoirs, use SAE
straight 20 or 30 weight motor oil. DO
NOT use a
multi-grade oils. Make sure the area around the oil
reservoirs is free from dust, dirt and debris before
opening the reservoirs.
• Make sure the oil reservoirs caps are tight.
• Keep water, dirt and debris from entering the oil
reservoirs. A small amount of a contaminant could
damage the transmissions.
Changing Oil & Filters
1. Park the machine on a smooth, level surface such as
a concrete floor. Disengage the PTO, engage the
parking brake, turn off the engine, and remove the
ignition key.
2. Place a drain pan under each transmission and
remove the filters to drain the oil. See Figure 31.
3. Once oil has drained from transmissions, replace
with new filters (P/N 21068-1), placing a light film on
the seal of the filter before installing. Hand-tighten
filter only.
4. Fill oil reservoirs 3/4 full with SAE straight 20 or 30
weight motor oil.
To Bleed Air From Transmissions
1. Locate the machine in a secure area, away from
bystanders and preferably facing a wall. Raise the
drive tires off the ground and secure with jackstands.
2. Start the engine and adjust throttle control to FULL
(highest setting). See the
STARTING THE ENGINE
section for proper starting instructions.
B
C
Figure 30. Oil Reservoirs
A. Oil Reservoirs
B. “FULL” Line
Figure 31. Transmission Oil Filter Location
(left-hand side shown)
Make sure transmissions and imme-
diate surrounding areas are free from
dirt and debris before changing the
oil and filters. Cleanliness while per-
forming this operation is extremely
important.
3. Run engine for 15 minutes. Watch the oil level in the
reservoirs. Add oil to the “FULL” line (B, Figure 30)
as necessary.
4. Watch oil levels for the next few days and add oil to
the reservoirs as necessary.