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CHECK SPARK PLUGS
Service Interval: Every 100 Hours
Remove spark plugs, check condition and reset
gaps, or replace with new plugs. See Engine
Owner’s Manual.
CHANGE HYDRAULIC SYSTEM FILTER
AND FLUID
Service Interval: Every 400 Hours
ZT-3400
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. Clean any loose debris
from around the perimeter of the filter. See
figure below.
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.
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 with three 1/4”
screws. Torque screws to 65 in/lbs (7.3 Nm)
each.
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 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.
10. Fill with 20W50 motor oil until oil just
appears at the bottom 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 below.
11. Install and torque the top port plugs to 180
in/lbs (20.3 Nm).
12. Continue to fill the transaxles through the
expansion tank until the “Full Cold” line is
reached on the Hydro-Gear expansion tank.
13. Re-install the expansion tank cap by hand.
Be careful to not over-tighten.
14. Proceed to the purge procedure.
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