
4090 Woodchipper
Service & Maintenance
Owners Manual
36
5.26 Belt Maintenance
Your woodchipper utilizes a single A belt to transfer engine power to
the rotor. As engine RPM’s are increased, centrifugal force causes
the clutch to bear down the belt which causes the rotor to spin at a
high RPM. This belt is a consumable and will wear over time. The
belt should be inspected every 10 hours of operation. During
operation, a jam may occur. This will cause the clutch to slip on the
belt causing a wear spot. If a jam occurs for more than 20 seconds,
the belt must immediately be replaced.
To change the belt, the belt guard must be removed. Then the belt
can simply be slightly turned and slipped off the rear rotor pulley.
During inspection, the belt must be checked for overall wear and
deep wear spots from jams. If the belt is worn, it must be replaced
with a A50 Kevlar belt.
To replace the belt, place the belt over the clutch, pull it tight, then
start the belt on the rear pulley, and complete the installation by
simultaneously pushing and turning the belt onto the pulley.
Belt Tension Procedure
Belt tension is important for the 4090 chipper to operate properly. If
the belt tension is too loose, the belt may slip causing excessive belt
wear, and if the belt is too tight, rotor RPM, may not reach the correct
speed. The correct belt for the 4090 chipper is an A50 Kevlar belt.
Gates “Predator” AP50 belts are the correct OEM supplied belt,
which offers the best life and performance. The belt on the 4090 is a
wear item. If needed other A50 belts can be used however different
manufacturers belts may be slightly larger / thinner, and belt tension
will need to be set accordingly.
Check and modify belt tension by completing the following steps:
1. Ensure that the motor is off, and the emergency stop is engaged.
2. Remove bottom belt cover. This is completed by removing the 2
wing bolts and pulling the steel belt cover from under the machine.