GB - 23
HYDROSTATIC BELT
REPLACEMENT
Remove (Figure 25)
1. Remove PTO belt (see PTO Belt
Replacement on page 22).
2. Disconnect electric clutch connector.
3. Remove clutch stop.
4. Disconnect idler spring.
5. Remove hydrostatic belt from hydrostatic
transmission pulleys, pulley, electric
clutch, and idler.
Install (Figure 25)
1. Install hydrostatic belt on idler, electric
clutch, pulley, and hydrostatic
transmission pulleys.
2. Connect idler spring.
3. Install clutch stop.
4. Connect electric clutch connector.
5. Install PTO belt (see PTO Belt
Replacement on page 22).
ELECTRIC CLUTCH
ADJUSTMENT
(915044, 046, 048, 050)
Test Mower Blade Stopping Time
(Figure 26)
To determine if the PTO stops the mower
blades within 5 seconds or less, measure the
amount of time from when the PTO is shut off
to when the PTO belt stops rotating.
1. Lower mower deck to the lowest
position.
2. Engage parking brake.
3. Start engine and set throttle lever to fast.
4. Engage PTO to start mower blades.
5. Shut off PTO and simultaneously start
measuring the amount of time it takes for
the PTO belt to stop rotating.
• If the PTO belt stops rotating in 5
seconds or less, the electric clutch
does not need to be adjusted.
• If the PTO belt does not stop in 5
seconds or less, adjust the electric
clutch.
Adjust Electric Clutch (Figure 27)
NOTE: Gravely recommends having the
electric clutch adjusted by a professional.
Contact your Gravely dealer.
If the electric clutch fails to engage or
disengage properly, begins to make an
abnormal noise, or if the mower blade
stopping time is too high, check the air gap at
the three inspection slots.
Inspect air gap:
1. Stop engine, set parking brake, remove
ignition key, and wait for all hot parts to
cool.
CAUTION: Use care when releasing
idler spring tension. Keep body parts
well away from idler when performing
this operation.
Figure 25
OE0051
1
1. Hydrostatic Belt
2. Hydrostatic
Transmission
Pulley
3. Electric Clutch
Connector
4. Pulley
5. Clutch Stop
6. Electric Clutch
7. Idler
8. Idler Spring
2
3
4
5
2
7
8
6
WARNING: The mower blades
MUST STOP in 5 seconds or less
when the PTO is disengaged. Adjust
or replace electric clutch as required.
Figure 26
OE0080
2
1
1. Electric Clutch
2. PTO Belt
