Gravely Pro-Turn 991200 Owner's And Operator's Manual page 26

Then run the unit for about one minute and
recheck the levels.
To Add Hydraulic Fluid:
(Figure 8)
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 26.
The hydraulic fluid should be at the cold
fill line of the expansion tank.
Change Hydraulic Fluid and Filter
(Figure 9)
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 transaxle.
3. Remove the oil drain plug or fitting from
the inlet port and allow the transaxle 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
5.4 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 transaxle). Install the drain plug and
tighten it to 15 lbf-ft (20.3 N•m).
8. Repeat steps 1 – 7 for the other
transaxle.
Figure 8
9. Follow the instructions in To Add
Hydraulic Fluid: on page 26.
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1. Drain Plug
2. Oil Filter
3. Filter Guard
4. Mounting Hardware
Purging the Hydraulic System
WARNING: 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. With the unit up to and facing a wall, lift
up the rear of the unit until both drive
wheels are off the ground.
2. Disengage the parking brake and put the
transaxle bypass levers in the neutral
position. See Moving the Unit with the
Engine Off on page 22.
3. Start the engine and slowly move the
steering levers to the forward and
reverse position five or six times.
4. Stop the engine and place the transaxle
bypass levers in the drive position. See
Moving the Unit with the Engine Off on
page 22.
5. Start the engine and slowly move the
steering levers to the forward and
reverse position five or six times.
6. Stop the engine, check the oil level and
add oil as needed.
7. Repeat steps 2 – 6 until the transaxles
operate smoothly in forward and reverse
position at normal speeds without
excessive noise.
EN - 26
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4
Figure 9
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