Gravely PM320, Owner/Operator And Parts Manual, Page: 8 / 30

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3. Install the long PTO belt on the electric clutch pulley on
unit. See Figure 6.
4. Connect the idler spring on the idler arm to the spring
anchor. See Figure 6.
NOTE: Tensioning the PTO belt is easier if you connect the
spring to the spring anchor, and then use the idler to tension
the belt. Place a 1/2-inch driver and ratchet extension into
square hole in PTO belt idler and install the PTO mower belt
on PTO belt idler while pulling idler towards the rear of unit.
NOTE: The PTO idler spring length range should be
13 – 13.25 in. (33 – 33.6 cm). Measure the spring length
with the deck set at 2 in. height for mowing at a 1 – 3 in.
cutting height. Measure the spring length with the deck set at
4 in. height for mowing at a 3 – 5 in. cutting height. Adjust
the idler spring length as needed, see figure 12.
5. Connect the lift chains on the carrier lift arms to the
mower deck with hardware attached to the deck lifts.
6. Attach the rear of the lift cylinder to the carrier frame with
1/2" x 4" bolt, 1/2" washer, spacer and 1/2" nut removed
in step 2 above (figure 7). Attach the front of the lift
cylinder to the cylinder mount with a 5/8" x 2-1/4" bolt,
5/8" lock washer and 5/8" center lock nut from the
hardware bag shipped with the deck.
7. Adjust the hydraulic hoses on the lift cylinder so they will
not contact the deck cover, and then tie them together
as shown in Figure 6.
8. Level mower deck. See Leveling the Mower Deck on
page 14.
9. Replace belt cover and then replace the deck cover.
Check Safety Interlock System
See Maintenance on page 11.
Check Function of All Controls
Ensure unit runs and performs properly. See Operation on
page 10.
Illustration
In Progress
Figure 6
OF3230
Electric PTO
Clutch
Long PTO Belt
Idler Spring
Idler Arm
WARNING: Failure of safety interlock and improper
operation could result in death or serious injury.
WARNING: Failure of controls could result in death
or serious injury.
Figure 7
OF3470
1. Mounting Hardware
(removed from
tractor)
2. Spacer
3. Lift Cylinder
4. Mounting Hardware
(from hardware bag)
1
3
4
2
1
Figure 8
OF3470
1. Lift Cylinder
2. Hoses 3. Cable Tie
3
2
1