Gravely 42 ZT XL Operator's Manual page 27

Check Hydraulic Fluid Level
(Figure 25)
Check the system with the unit cold and
parked on a flat, level surface.
Then run the unit for about one minute and
recheck the levels.
To Add Hydraulic Fluid:
(Figure 25)
1. Remove the cap from the expansion
tank.
2. Fill the expansion tank with 20W-50
engine oil with an SL API classification
until oil level reaches the cold fill line on
the tank.
3. Install the expansion tank cap and then
purge the system. See "Purging the
Hydraulic System" on page 28.
The hydraulic fluid should be at the cold
fill line of the expansion tank.
Figure 25
Change Hydraulic Fluid and Filter
(Figure 26)
NOTE: Change hydraulic fluid and filter after
the first 75 hours of operation and then every
400 hours. Use 20W-50 engine oil with an SL
API classification.
1. Place container under oil filter to catch
oil.
2. Remove the filter guard and oil filter from
the trans axle.
3. Remove the oil drain plug or fitting from
the inlet port and allow the trans axle to
drain completely.
4. Clean the filter mounting surface and
then lubricate rubber gasket on new oil
filter with clean hydraulic oil.
5. Spin new oil filter onto filter housing until
it makes contact. Tighten oil filter
another 3/4 turn.
6. Install the filter guards removed in
step 2. Tighten the mounting screws to
5.38 lbf-ft (7.3 N•m).
7. Fill with 20W-50 engine oil with an SL
API classification until oil appears at the
bottom of the drain plug (about 2 quarts
per trans axle). Install the drain plug and
tighten it to 14.97 lbf-ft (20.3 N•m).
8. Repeat steps 1 – 7 for the other trans
axle.
9. Follow the instructions in "To Add
Hydraulic Fluid:" on page 27.
1
1. Drain Plug
2. Oil Filter
3. Filter Guard
4. Mounting Hardware
GB - 27
2
4
Figure 26
3