Gravely 992184 Owner's/Operator's Manual page 21

HYDRAULIC FLUID
WARNING: HYDRAULIC FLUID
can result in severe burns. Fluid in
hydraulic system can penetrate
skin and result in serious injury or
death.
Be sure to stop the engine before
doing any work on hydraulic parts.
Keep body and hands away from
pin holes or nozzles which expel
hydraulic fluid when under
pressure. Use paper or cardboard,
not hands, to search for leaks.
Ensure all hydraulic fluid
connections are tight and all
hydraulic hoses and lines are in
good condition before applying
pressure to system.
FOREIGN FLUID INJECTED INTO
BODY can result in gangrene.
Fluid must be surgically removed
within a few hours by a doctor
familiar with this form of injury.
Check Hydraulic Fluid Level
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:
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 22.
The hydraulic fluid should be at the cold
fill line of the expansion tank.
Change Hydraulic Fluid and Filter
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. Run the unit for a few minutes to warm
the hydraulic fluid, and then shut off the
engine, remove ignition key, and wait for
all moving parts to stop before servicing
unit.
2. Place container under oil filter to catch
oil.
3. Remove the filter cover from the
transaxle. Remove and discard the
o-ring from the cover.
4. Remove the bottom oil fill vent port plug
from the transaxle to drain completely.
5. After the oil has drained from the unit,
replace the bottom oil fill vent port plug
and then remove the oil filter.
6. Clean the filter mounting surface and
then lubricate rubber gasket on new oil
filter with clean hydraulic oil.
7. Spin new oil filter onto filter housing until
it makes contact. Tighten oil filter
another 3/4 turn.
8. Install the filter cover removed in step 3.
Tighten the mounting screws to 480–
540 lbf-in (54 – 61 N•m).
9. Remove the top fill vent port plug and fill
with 20W-50 engine oil with an SL API
classification until oil reaches the bottom
of the drain plug (about 151 ounces
(4475 mL) per transaxle). Install the
drain plug and tighten it to 200 lbf-in
(22.5 N•m).
10. Follow the instructions in To Add
Hydraulic Fluid: on page 21.
11. Repeat steps 2–9 for the other
transaxle.
GB - 21
Figure 7