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12
9.5 V-belt replacement
Disconnect machine from power source. Follow
steps in sect. 7.4 to access pulleys and belt. Slide
motor forward to loosen belt and slip belt off pulleys.
Install new belt and slide motor back to tension it.
Secure all covers and screws.
9.6 Additional servicing
Any additional servicing should be performed by
authorized service personnel.
10.0 Optional accessories
The following adaptor plates are available for
mounting your grinder to the JDCS-505 JET Dust
Collection Stand. Contact your dealer to order, or
call JET at the phone number on the cover.
# 414832 – Adaptor Plate Kit (for BGB-142/248)
# 414833 – Adaptor Plate Kit (for BGB-260-1/260-3)
11.0 Troubleshooting BGB-series Belt Grinders
Symptom Possible Cause Correction*
Motor will not start Low voltage. Check power line for proper voltage.
Open circuit in motor or loose
connection.
Inspect all lead connections on motor for
loose or open connections.
Motor will not start: fuses
or circuit breakers blow
Short circuit in line cord or plug. Inspect cord or plug for damaged insulation
and shorted wires.
Short circuit in motor or loose
connections.
Inspect all connections on motor for loose or
shorted terminals or worn insulation.
Incorrect fuses or circuit breakers in
power line.
Install correct fuses or circuit breakers.
Machine slows when
operating
Applying excessive pressure of
workpiece against platen.
Reduce pressure against abrasive/platen.
V-belt loose. Tighten V-belt.
Loud, repetitive noise
coming from machine
Pulley setscrews or keys are missing or
loose.
Inspect keys and setscrews. Replace or
tighten if necessary.
Motor fan is hitting the fan cover. Tighten fan or shim cover.
V-belt is defective. Replace V-belt.
Poor tracking Improper abrasive belt splice. Check belt for irregular seam or shape.
Excessive belt tension. Set tension so belt is just taut.
Insufficient belt tension. Set tension so belt is just taut.
Worn contact surfaces. Check surface of contact wheels. Replace
worn wheels.
Misaligned contact surfaces. Check alignment of tracking wheels and
contact wheel. Realign if needed.
Lack of crown on drive wheel. Check for 1/16-inch crown. Replace drive
wheel if crown is not present.
Worn bearings. Check all bearings for overheating or
damage. Replace worn or damaged bearings.
Slack abrasive belt Insufficient belt tension. Set tension so belt is just taut.
Contact wheel wear Excessive belt tension. Set tension so belt is just taut.
Grinding in one area on belt. Use entire work surface of belt whenever
possible.
Excessive grinding deposits on belt and
debris in machine.
Periodically clean interior of grinder.
Short abrasive belt life. Excessive grinding pressure. Allow belt to do the cutting. Excessive
pressure dulls belt and removes grit from it.
*Warning: Some corrections may require a qualified electrician.
Table 11-1
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