Drive Belt Replacement; Mower Tire Pressure; Deck Leveling Procedure - Ventrac HP720 Owner/Operator's Manual & Parts List

Deck Belt Replacement (cont.):
3. Remove the left hitch arm mounting bolt and lift the hitch arm up from the mounting
brackets on the deck.
4. Remove old belt. Note that one belt loop must surround the left hitch arm. This is the
reason for removing the left hitch arm mounting bolt.
5. Install the new B158 belt (Part # 81.B158 for 60") or B180 belt, (Part #81.B180 for
72" deck) as shown in the diagram below. Begin by placing one belt loop around the
left hitch arm. Place belt into the idler pulley and then the drive pulley. Take the belt
to the right spindle pulley rotating it 1/4 turn counterclockwise.
6. Once around the pulley, follow the diagram to the other pulleys. Note: the "V" shape
of the belt should fit nicely into each pulley.
7. Reinstall the left hitch arm.
8. Tension the belt by tightening the idler adjustment rod. Spring coils should be
separated enough to slip a paper clip (approximately 1/32") between them.
PTO Drive Belt Replacement:
Remove mower from tractor. Remove pulley cover and place new belt B45
(Part #81.B045) over pulley and left hitch arm. Reinstall cover.

Mower Tire Pressure:

Mower tire inflation pressure should be maintained at 8-10 psi. Pressure variables are
one cause for an uneven cut.

Deck Leveling Procedure:

(Check for bent blades before making adjustments)
1. Before making any deck leveling adjustments, check pressure in both mower tires.
Inflate or deflate to 8-10 psi.
2. Set mower on a level hard surface. Select a high cutting height position with enough
distance from floor surface to bottom side of blade for measuring.
MAINTENANCE
D-4