Scag Power Equipment LYBERTY Z SZL-36H-18FR Operator's Manual page 37

Section 7
11. Move the dump valve controls to the "freewheel"
position by pulling the levers backward and locking
in the notch (towards the rear of the mower).
See Figure 7-4.
DUMP VALVE
CONTROL LEVER
"DRIVE" POSITION
Figure 7-4. Dump Valve Control Lever
12. While in the operator's position, start the engine and
disengage the parking brake.
13. Run the engine at 1/2 throttle and move the steering
control levers to full forward and reverse 5 to 6
times.
14. Engage the parking brake. Move the dump valve
control levers to the "drive" position. See Figure 7-4.
15. While in the operator's position, run the engine at
1/2 throttle. Release the parking brake, move the
steering control levers to full forward and reverse 5
to 6 times. It may be necessary to repeat steps 12 to
15 until the air is completely purged from the system.
16. After the purge process is complete, remove the side
top port plug from both transaxles to check the oil
level. See Figure 7-2. If necessary, fill oil until the oil
just appears at the bottom of each axle top port.
B. CHANGING HYDRAULIC OIL -
TORQ TZ450 TRANSAXLES
For Tuff Torq TZ450 transaxles, the hydraulic system
oil and filter should be changed after the first 50 hours
of machine operation and every 250 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.
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. Clean any loose debris around the perimeter of the
filter and drain plug on both transaxles.
REMOVE OIL
FILTER
Figure 7-5. Hydraulic Oil Filter and Drain Plug
3. Place a suitable container under the drain plugs and
hydraulic oil filters.
4. Remove the drain plugs from both axles and allow
the fluid to drain into the container. Properly discard
the oil when the system has drained completely.
See Figure 7-5.
5. Once the hydraulic system has drained, remove the
hydraulic filters from both axles.
6. Install new drain bolt hardware on both transaxles
and torque to 15-18 ft/lbs.
7. Install new hydraulic oil filters to both axles.
8. Clean residual residue off caps and reinstall. Torque
the cap to 6-9 ft/lbs.
TUFF
9. Clean and remove the fill port dipstick and vent valve cap
from the top of both transaxle. See Figure 7-6. Fill each
transaxle with Tuff Torq Tuff Tech Oil. Approximately 1.95
quarts capacity per transaxle (3.9 quart total). Reinstall
the fill port dipstick and vent valve cap.
33
- IMPORTANT -
REMOVE AND DISCARD
OIL DRAIN PLUG
R