Gravely 420RX Operator's Manual page 25

1. Drive Pulley
2. Driven Pulley
3. Hand squeeze the belt together between drive pulley
and driven pulley to force belt into the driven pulley.
This should open driven pulley side walls allowing
room to remove the belt.
4. Remove belt by rolling it off over the driven pulley and
then lifting it up off the drive pulley.
5. Reinstall new belt by placing it over the drive pulley
and then rolling it over the variable driven pulley.
6. Reinstall belt cover and fasteners.
7. Reconnect battery negative cable.
8. Remove blocks securing cargo bed up and lower cargo
bed.
Driven Pulley Maintenance
The driven pulley should be inspected for wear at the cam
shoes to prevent damage to pulley and pulley compression
spring.
1. Secure vehicle for maintenance. See Securing Vehicle
for Maintenance on page 20.
2. Remove screws securing drive belt cover. Pull cover
back to inspect.
3. Check cam shoes on driven pulley every 100 hours or
less for wear. Cam shoes should be at least 1/16"
(1.6 mm) above aluminum hub when measuring
parallel to the cam incline.
DANGER: Do not replace cam shoes without
contacting your Gravely dealer for assistance.
The compression spring can cause bodily injury if
replacement is done incorrectly.
4. Replace all cam shoes if there is less than 1/16"
(1.6 mm) clearance between aluminum housings.
Contact your nearest Gravely vehicle dealer for
replacement assistance.
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Figure 16
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2
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1. Aluminum Housing
2. Cam Shoe (3 Required)
3. Housing-to-Housing Clearance. Replace if clearance is
less than 1/16" (1.6 mm)
Engine Air Filter Maintenance
NOTE: Do not operate engine with a damaged air filter or
without an air filter element. Dirt will enter engine causing
dust ingested engine problems.
NOTE: Do not block air intake port leading to air cleaner.
Placing an object on the platform in front of the air intake
duct or allowing loose clothing to drape over the duct could
block the duct opening.
1. Engine Air Intake Duct
1. Release retaining clips (item 5) to remove canister
access cover (item 4) and filter element (item 3). Clean
canister (item 2) with a damp cloth.
GB - 25
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Figure 16
Figure 17
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3
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