Hydraulic System - Scag Power Equipment LYBERTY Z SZL-36H-18FR Operator's Manual

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7.9 HYDRAULIC SYSTEM

A. CHANGING HYDRAULIC OIL -
HYDRO-GEAR ZT TRANSAXLES
For Hydro-Gear ZT transaxles, the hydraulic system oil
and filter should be changed after the first 75-100 hours
of machine operation and every 400 hours or annually
thereafter, whichever occurs first. The oil should also be
changed if the color of the fluid has become black or milky.
A black color and/or a rancid odor usually indicates possible
overheating of the oil, and a milky color usually indicates
water in the hydraulic oil.
- IMPORTANT -
The hydraulic system oil should be changed if you
notice the presence of water or a rancid odor to
the hydraulic oil.
1. Park the mower on a level surface and stop the
engine.
2. Remove the three 1/4" filter guard screws and filter
guard from both axles. See Figure 7-1. Clean any
loose debris around the perimeter of the filter.
REMOVE SCREWS AND
OIL FILTER GAURD
Figure 7-1. Hydraulic Oil Filter and Drain Plug
3. Place a suitable container under the hydraulic oil
filters.
4. Remove the hydraulic filters from both axles and
allow the fluid to drain into the container. Properly
discard the oil when the system has drained
completely. See Figure 7-1.
5. Once the hydraulic system has drained, install new
hydraulic oil filters to both axles by hand, turn 3/4
to one complete turn after filter gasket contacts the
filter base.
6. Reinstall the filter guards and torque the screws to
65 in/lbs.
REMOVE OIL
FILTER
32
7. Remove the top port plug from both axles before
filling with oil. See Figure 7-2.
REMOVE TOP
PORT PLUG
Figure 7-2. Top Port Plug Location
8. Remove the fill port plug from the top of both
transaxle. See Figure 7-3. Fill each transaxle with
Scag Hydraulic System Oil (p/n 486255 - 1 Quart or
p/n 486254 - 1 Gallon) oil until the oil just appears
at the bottom of each axle top port. Approximately 2
quart capacity per transaxle (4 quart total). Reinstall
the top port plugs and torque to 180 in/lbs.
FILL PORT PLUG
Figure 7-3. Right Side Fill Port Plug
9. Reinstall the fill port plug on the top of the transaxle.
10. The hydraulic system will need to be purged of
all air. Raise the rear of the machine so the drive
wheels are off the ground. Use jackstands and block
the front caster wheels to prevent the machine from
moving.
Section 7