Gravely 915162 - Page 27

GB - 27
Check Hydraulic Fluid Level
(Figure 25)
Check the system with the unit cold and
p
arked on a flat, level surface.
Then run the unit for about one minute and
recheck th
e levels.
To Add Hydraulic Fluid:
(Figure 25)
1. Remove the cap from the expansion
t
ank.
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
pur
ge the system. See “Purging the
Hydraulic System” on page 28.
Change Hydraulic Fluid and Filter
(Figure 26)
NOTE: C
hange 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 tr
ans 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 cont
act. 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.
Figure 25
The hydraulic fluid should be at the cold
fill line of the expansion tank.
Figure 26
1. Drain Plug
2. Oil Filter
3. Filter Guard
4. Mounting Hardware
1
4
3
2