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Section 7
7.2 HYDRAULIC SYSTEM
A. CHANGING HYDRAULIC OIL
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 GUARD
REMOVE OIL
FILTER
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 7-2.
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.
7. Remove the side top port plug from both transaxles
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.
