STOBER Drives Inc. • Form No. 442757 • www.stober.com • 1781 Downing Drive • Maysville, KY 41056 • 606-759-5090 • sales@stober.com
The ComTrac is an adjustable speed tracon drive that
transfers power between a motor mounted drive cone and a
tracon ring.
Maintenance and Repair
ComTrac Adjustable Speed Drives automacally compensate
for normal wear of the tracon ring. However, if aer
several thousand hours the annular contact surface of the
tracon ring becomes worn, the output sha of the drive
will slip, and tend to stop under normal load – especially at
the top end of the speed range.
The condion of the tracon ring can be checked aer
removal of the housing cover (see illustraon). The tracon
ring must be replaced when the annular contact surface
has worn down almost to the metal edge of the mounng
ange.
Observance of the nameplate power range for the parcular
ComTrac Drive in use will ensure that the tracon ring will
wear evenly.
Changing the Tracon Ring
Cauon: Appropriate eye protecon must be worn prior to
beginning this procedure.
Step 1 Remove the 4 socket head cap screws and remove
the housing cover.
Step 2 Carefully pull out the tracon ring complete with the
ange and sha from the bearings.
Cauon: Protect the precision ground sha from damage.
Step 3 Remove the tracon ring from its ange as shown
below.
Step 4 Press in the new tracon ring by applying light
hammer strokes unl the ring is evenly seated. Use a block
of hardwood between the hammer and the ring or use a
so mallet. Be careful not to damage the new tracon
ring. Clean the housing and the ring hub.
Step 5 If desired, replace the tracon ring, ange (11), and
sha assembly (12) complete (Kit C).
Step 6 Carefully replace the tracon ring and sha taking
precauon not to damage the oil seal. Rotate the ring/sha
assembly to be sure the cams are properly seated.
Step 7 Be sure the annular contact surface of the tracon
ring and the drive cone surface are not damaged during
assembly, and are free from grease. Wipe o any oil or
grease with a dry rag, or preferably a clean paper ssue.
Step 8 When reassembling the housing, do not use more
force than is necessary to overcome the spring pressure.
Step 9 Replace the lubricant in the bearing/cam chamber
with the proper amount of lubricant. Replace the oil ll
plug.
Step 10 Grease the motor slideways by pumping small
amounts of grease through the grease ngs.
Step 11 The new tracon ring requires me to run in.
Therefore, avoid running the drive at full load during the rst
few hours of operaon.
MGS® ComTrac® Adjustable
Speed Drive Systems (C, F, K)
STOBER Drives Inc. • Form No. 442757_EN • www.stober.com • 1781 Downing Drive • Maysville, KY • 1-800-711-3588 • sales@stober.com
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