Gravely Pro-walk hydro 36HR PG Owner's/Operator's Manual page 34

NOTE: If necessary the filter guard (B) may
be removed for easier access to the filter.
Loosen (do not remove) two hex bolts
retaining the filter guard and slide guard off of
bolts.
B
Figure 31
6. Apply a film of clean oil to gasket of new
filter.
7. Install filter. Turn filter clockwise until
gasket makes contact with the mounting
surface. Tighten 1/2 to 3/4 turn after
contact.
8. Fill reservoir until oil level is 5 in.
(127 mm) from the top of the filler pipe
NOTE: Total system capacity is
approximately 5 qt (4.7 L) however some oil
will remain in the wheel motors and lines.
Approximately 3.5 qt (3.3 L) is required to
refill to a safe operating level.
9. Install filler cap on reservoir.
10. Start engine and run at 3/4 throttle
position. Release the parking brake and
cycle the control levers forward and
rearward several times. Check for leaks.
11. Stop engine. Check reservoir oil fluid
level. Add oil as necessary.
MOWER SERVICE
Adjusting Deck Belt Tension
(Figure 32)
1. Park unit safely. (See PARKING on
page 19.)
A
2. Remove mower center belt cover.
3. Measure the length of the idler arm
tension spring (A) between the inside
edges of both end hooks. Length should
be:
• 988153, 56: 4-5/8 in. ± 1/8 in. (11.7 cm
± 3 mm).
• 988154, 55, 57, 58: 4-7/16 in. ± 1/8 in.
(11.1 mm ± 3 mm).
• 988159: 12.5in. ± 1/8in. (31.8 cm ± 3
mm).
4. Loosen jam nut (B) and adjust threaded
rod until proper spring length is
obtained.
5. Tighten jam nut.
6. Replace mower center belt cover.
B
B
GB - 34
988153, 56
A
988154, 55, 57, 58
A
988159
A
Figure 32
B