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Service Bulletin
Vege-Polisher ™ Belt Tensioning Models WP2412 & WP3014
Consult | Design | Manufacture | Install | Support wymasolutions.com
New Zealand Head Office Wyma Engineering (NZ) Ltd.
27 Foremans Road, Hornby, 8042 PO Box 16-707, Christchurch
New Zealand P +64 3 344 6403 F +64 3 344 6407
Background
During the first few weeks, drive belts settle in and may stretch slightly. If belts lose tension, they
can start to slip on the main drive pulley.
For the first 250 hours of operation, check belt tension daily. After this time, belts stretch more
slowly. Check tension every second day from then on.
Recognising Belt Slippage
Drum stays still or turns very slowly but drum drive pulley spins at normal speed.
Drum stops or turns the opposite way.
Brushes turn slower than usual.
Friction on belt causes smoke and/or a smell of burning rubber.
Thumping/whirring is heard as belt slips over the pulleys/drum.
Excessive uneven belt wear, hardening and/or cracking.
Recognising Over-tensioned Belt
Drum support rollers do not rotate with the drum, or only rotate occasionally.
Severe belt groove wear.
Excessive loud noise.
Part Descriptions
Drum drive
V-belt
Drum
Drum drive
V-pulley
Drum
support
rollers OUTFEED END INFEED END
Brush drive
V-belt
Brush drive
V-pulley
Drum
support
rollers
Pulley
Consult | Design | Manufacture | Install | Support Page 2 of 3
Tensioning Procedure
1. Make sure machine is off and locked.
2. Slide door open to access belt tensioner.
3. Loosen locknut.
4. Turn tensioner nut to raise/lower the motor.
5. Tension belt until drum lifts slightly off drum support rollers then lower drum until it just touches drum support rollers again.
Note: Check belt tension by hand. Take hold of the belt (A) and use reasonable force to turn
clockwise. When correctly tensioned, belt should only move a quarter turn (B). If belt is loose, see
Step 6 below.
6. If belt is still slipping, turn tensioner nut another turn or so.
7. When tensioned correctly, re-tighten locknut, replace all covers and close door.
8. Securely fasten all parts before operation.
Warning: If drum and support rollers are not in contact, machine will fail!
A B
Checking Belt Tension
Tensioner
locknut
Tensioner
nut
Tensioner Assembly
Consult | Design | Manufacture | Install | Support Page 3 of 3
Synchronous Belt Tensioning
Check synchronous belt tension by hand. Belt should only move slightly when tugged hard with
both hands. If belt moves easily, adjust tension.
Tensioning Procedure:
1. Make sure machine is off and locked.
2. Open side door.
3. Hold both cable ends with appropriate tooling then release turnbuckle locknuts. Turn turnbuckle barrel until the synchronous belt becomes tight.
4. Re-check belt tension.
5. When tensioned correctly, tighten turnbuckle locknuts. Do not twist the cable.
6. Securely fasten all parts before operation.
Tensioning Mechanism
Turnbuckle
barrel
Checking Belt Tension