Gravely ZT HD 44 Operator's Manual page 26

3. Operate engine for 1 minute and recheck
oil levels.
4. Add hydraulic oil, if needed.
a. Remove expansion tank caps.
b. Fill expansion tanks with 15W-50
synthetic motor oil (Gravely p/n
00057100) until oil reaches the cold
fill indicator mark. See Figure 28.
c. Reinstall expansion tank caps.
Change Hydraulic Oil and Filter
1. Operate unit for a few minutes to warm
hydraulic oil.
2. Stop engine, remove key and wait for all
moving parts to stop and for hot parts to
cool.
3. Position container under oil filter to catch
used oil.
See Figure 29.
4. Remove filter guard and oil filter from
transaxle.
5. Remove the vent / fill plug from the fill
port and allow transaxle to drain
completely.
Figure 29
6. Wipe filter-mounting surface clean.
7. Lubricate rubber gasket on new oil filter
with clean hydraulic oil.
8. Spin filter onto filter housing until it makes
contact, and then turn filter 3/4 turn to
tighten.
9. Reinstall filter guard and torque to 7.3
N•m (65 lb-in). DO NOT overtighten.
10. Add 15W-50 synthetic motor oil (Gravely
p/n 00057100) until oil appears at the
bottom of the fill port (1892.7 mL (64 fl.
ounces) per transaxle).
11. Reinstall the vent / fill plug and torque to
20.3 N•m (180 lb-in).
12. Add hydraulic oil to expansion tank until
oil reaches cold fill indicator mark.
13. Repeat steps 3 – 12 for other transaxle.
14. Purge hydraulic system. See Purge
Hydraulic System on page 24.
Purge Hydraulic System
Purge air from hydraulic system after draining
oil or changing the filter.
WARNING: AVOID INJURY.
This adjustment requires
operating the engine. Use
extreme care to avoid contact
with moving parts and hot
surfaces. Be sure rear of unit
is well supported and secure
before starting engine.
1. Park unit facing a wall or chock wheels.
2. Release parking brake.
3. Support unit so drive wheels are off the
ground.
4. Bypass transaxles. See Move Unit
Manually on page 19.
5. Start the engine and slowly move steering
levers forward and backward 5 or 6 times.
6. Return transaxle bypass levers to
operating position. See Move Unit
Manually on page 19.
7. Slowly move steering levers forward and
backward 5 or 6 times.
8. Stop engine, lower unit to ground and
check oil level. Add oil if needed.
9. Repeat steps 1 – 8 until transaxles
operate smoothly in forward and reverse
at normal speed without excessive noise.
EN - 24