Service Manual — COATS Models 950/950 ProRacer/1025/1050/1055 • 1
Introduction
This service manual contains the functional checks,
troubleshooting, adjustment, and part replacement
instructions for COATS
®
Models 950, 950 Pro Racer,
1025,1050 and 1055 Wheel Balancers. Exploded views,
illustrations, and an indexed parts list facilitate parts
location, ordering, and replacement. All adjustments
and replacements can be rendered with mechanic's or
electrician's tools.
Safety Notes
High voltages, high torque motors, and high speed
rotating wheels are present in coats wheel balancers.
Follow the safety rules below while servicing a bal-
ancer:
1.
Disconnect balancer from power source before
starting any part replacement or internal adjustment.
2.
Lower guard hood before starting cycle.
3.
Do not wear neckties or loose clothing while serv-
icing the balancer.
4.
Be aware of hair length. If hair is long, wear it up
under a hat.
5.
Mounting cones must be centered in wheel before
tightening. The wheel must be forced up firmly against
the faceplate. The hub nut must be engaged by a mini-
mum of four (4) full threads. Tighten hub nut by rotating
the wheel and striking a spoke of the hub nut with the
heel of the hand. Failure to tighten the hub nut could
result in serious injury.
Servicing
Service should be performed only by COATS
®
trained
and authorized service personnel. The troubleshooting
and service procedures in this manual are arranged to
allow rapid and thorough service. The steps are prelim-
inary inspection, functional checks, repair of failure,
replacement or adjustment, and functional checks.
Identification of replacement parts required can be
accomplished by using the pictorial breakdown and
index in this manual. It is important that the functional
checks be performed in sequence and the problem iso-
lated prior to attempting any adjustments or replace-
ments. If an adjustment or replacement is made, the
entire functional checks must be performed success-
fully before the balancer can be considered available for
service.
Equipment Needed
1.
AC - DC / Volt - Ohm meter.
2.
Test Wheel - Domestic 14
, 15 or 16-inch diameter
x 6
- 6 1/2-inch wide
steel wheel with a
center hole
suitable for mounting with a back cone. A
new 70
series
tire properly mounted and inflated, balanced to
within 0.05 ounces should be part of this
wheel
assembly. The lateral run out of this wheel
should be less than 1/8".
3.
Mechanic's and electrician's tools.
4.
Thread locking anaerobic (Loctite 242 or equiva-
lent).
5.
Retaining compound (Loctite 601 or equivalent).
6.
Dial indicator (runout gauge) with magnetic base,
Starret No. 25-431 or equivalent.
7.
Modeling Clay.
8.
Motor Controller PCB tester (# 8112708)
9.
*Membrane Touch Panel Tester (8112929)
Direct Drive
