Service Manual

ZT-2800
®
/ZT-3100/ZT-3400™ 9
Typically, an engine oil with a minimum rating
of 9.0 cSt (55 SUS) at 230° F (110° C) and an
API classication of SL is recommended. A
20W50 engine oil has been selected for use
by the factory and is recommended for normal
operating procedures.
Fluid Volume and Level
Fluid volume information is provided in
the table below. Total system volume will de-
pend on expansion tank size, hose length and
transaxle volume.
Certain situations may require additional uid
to be added or even replaced. Refer to page 10
and gure 5 for the proper ll port location.
Purging will be required if oil has been changed.
Refer to the purging procedures on page 12.
SERVICE AND MAINTENANCE
External Maintenance
Regular external maintenance of the transaxle
should include the following:
1. Check the vehicle operator’s manual for the
recommended load ratings. Insure that the
current application does not exceed load
rating.
2. Check oil level in accordance with “Fluid
Change Procedure,” step 12. Refer to page
11.
3. Inspect the vehicle drive belt, idler pulley(s),
and idler spring(s). Insure that no belt slip-
page can occur. Slippage can cause low
input speed to the transaxle.
4. Inspect the vehicle control linkage to the
directional control arm on the transaxle. Also
insure that the control arm is securely fas-
tened to the trunnion arm of the transaxle.
5. Inspect the bypass mechanism on the
transaxle and the vehicle linkage to insure
that both actuate and release fully.
Service and Maintenance Proce-
dures
Some of the service procedures presented on
the following pages can be performed while the
transaxle is mounted on the vehicle. Any repair
procedures as mentioned in the repair section
of this manual must be performed after the unit
has been removed from the vehicle.
Fluids
The uids used in Hydro-Gear products have
been carefully selected, and only equivalent, or
better products should be substituted.
Fluid Description
20W50 engine oil
ZT-2800/ZT-3100/ZT-3400
Component Volume
Transaxle (bottom of ll port) 2284 ml (77.23 . oz.)
Note: Theoilvolumegureshowndoesnot
includewhatisintheexpansiontank
hoseortheexpansiontank.Thatwill
havetobedeterminedbythemachine
manufacturer/enduserduetovarying
hosesizes/lengthsandexpansiontank
sizes.