Fluid Change Procedure - Hydro-Gear ZT-2800 Service And Repair Manual

FLUID CHANGE PROCEDURE

This transaxle is designed with an external filter for ease
of maintenance. To ensure constant fluid quality levels and
longer life, an initial oil and filter change at 75-100 hours,
then every 400 hours thereafter is recommended.
The following procedure can be performed with the
transaxles installed in the vehicle, and the vehicle on level
ground. Apply the bypass valve for each transaxle and lock
the vehicle parking brake.
1. Remove the three 1/4" filter guard screws and filter
guard as shown in figure 5 or the two 1/4" filter guard
screws and filter guard as shown in figure 6. Clean any
loose debris from around the perimeter of the filter. See
figures 5 and 6.
CAUTION: Transaxles with internal expan-
sion tanks must be cool (less than 100°F)
before changing the oil. Failure to allow the
unit to cool prior to changing the oil could result
in overfilling the unit and damaging the breather
assembly.
Note: Before draining oil ensure the oil that will be
removed is less than 100°F before doing so. Units
equipped with an internal expansion tank will re-
tain oil that has expanded due to an increase in
temperature and may result in an overfill and over
expansion when refilled.
2. Place an oil drain pan (12" or more diameter and 8 qt.
capacity is optimal) beneath the oil filter. Remove the oil
filter from the transaxle. Reference page 10 for removal.
3. After the oil has drained, wipe the filter base surface
off and apply a film of new oil to the gasket of the new
replacement filter (Hydro-Gear part number 52114).
4. Install the new filter by hand, turn 3/4 to one full turn
after the filter gasket contacts the filter base surface.
5. Re-install the filter guard and 1/4" screws. Torque
screws to 115 in. lbs. (12.99 Nm) each.
Fill Port Plug
Top Port Plug
Figure 5, Unit Without Internal Expansion Tank
ZT-2800 /ZT-3100 /ZT-3200
® ®
Filter
Filter Guard
Screws
TM
6. Repeat steps 1-5 on the opposite side transaxle drive.
7. Drain old oil filters of all free flowing oil prior to disposal.
Place used oil in appropriate containers and deliver to an
approved recycling collection facility.
8. Remove the top port plug (figure 6) from the left side and
right side transaxles prior to filling with oil. This will allow
the transaxles to vent during oil fill.
9. Remove the cap from the transaxle's expansion tank
located on the vehicle frame.
Note: For units that do not have an external expan-
sion tank remove the fill port plug on the top of the
housing (figure 6).
10. Fill with 20W50 motor oil until oil just appears at the bot-
tom of each transaxle's top port (approximately 2 qts. per
transaxle, 4 qts. total). Install the top port plug into each
transaxle as the oil level reaches this port. See Figure 6.
11. Install and torque the top port plugs to 120 in. lbs. (20.3
Nm).
Note: For units that do not have an external expan-
sion tank replace the fill port plug on the top of the
housing (figure 6), torque to 120 in. lbs. and proceed
to the purge procedure on page 12.
12. Continue to fill the transaxles through the expansion tank
until the "Full Cold" line is reached on the Hydro-Gear ex-
pansion tank (refer to vehicle owner's manual for specific
volumes).
13. Re-install the expansion tank cap by hand. Be careful to
not overtighten.
14. Proceed to the purge procedure on page 12.
Breather vent on units equipped with
internal expansion tank.
Fill Port Plug
Top Port Plug
Figure 6, Unit With Internal Expansion Tank
Filter
Filter Guard
Screws
11