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SUBJECT
New conveyor gear motors, brushes, and pickup clamps for Middleby Marshall ovens
GENERAL
The conveyor gear motors used on all Middleby Marshall ovens (except model PS536) have been redesigned by the
vendor. Changes to the motors include:
A smaller-diameter motor casing.
New motor brushes.
- Old-style motors continue to use brush P/Ns 22450-0052 or 22450-0230 as shown in the table below.
-
All of the new motors use brush P/N 46658.
A shorter clamp to attach the pickup assembly. This accommodates the smaller diameter of the motor.
- The pickup assembly with the original clamp is still available as P/N 27170-0263. This kit is only available in
limited quantities.
After our stock of the old-style pickup assembly kit is exhausted, you will need to save the
existing clamp to attach a new pickup assembly to an old-style motor.
- The pickup assembly with the new, shorter clamp is available as P/N 46451.
- All of the new motors will be shipped in a kit that also includes the new clamp. This allows you to attach an
existing pickup assembly to a new motor.
- In 7/01 and 8/01, some of the new motors were shipped under the part numbers of the old motors. These parts
shipped without the new clamp. In most of these cases, you can tighten the existing clamp to fit the new motor.
Some older clamps, however, cannot be tightened enough to fit.
To be sure that you can install the new motor
in all ovens, you should add the new clamp, P/N 46602, to your required parts stocking list, and carry a few
spare clamps on each service vehicle.
Please be aware of these changes as you order your stocking parts. Some versions of the old motor, as well as the old-
style pickup assembly, are still available in limited quantities. The brush for the old motor (P/N 22450-0052) will remain
available in order to maintain motors already in the field.
Bulletin No. MM-189
Date: 8/24/01
Middleby Cooking Systems Group
1400 Toastmaster Drive Elgin, IL 60120-9272 U. S. A. Telephone: (847)741-3300 Service and Parts Fax: (847)741-4406
Service Bulletin
Old Old Old New New New New
Ratio Used on Motor Brush Pickup Motor* Brush Pickup Clamp
1400:1 PS310 27384-0008 22450-0052 27170-0263 46603 46658 46451 46602
PS314
PS360/360S
PS360SS High Speed
PS360T Tandem
PS360WB
PS360WB70
PS360EWB
PS555
PS570/570S Single Belt
1350:1 PS200/220FS/224 27384-0011 22450-0230 27170-0263 46604 46658 46451 46602
PS200VL/220VL/224VL
PS200R68/220R68/224R68
PS200T Tandem
PS570/570S Split Belt (Standard)
600:1 PS314SBI 27384-0003 22450-0052 27170-0263 46605 46658 46451 46602
300:1 PS200/220FS/224 (High Speed) 27384-0014 22450-0230 27170-0263 46606 46658 46451 46602
PS570/570S Split Belt (High Speed)
* New Motor part numbers shown in this table are kits that include both the motor and the new pickup clamp.
SECTION 3 - SERVICING COMPONENTS
Appendix - Service Bulletin MM-189 - New Conveyor Gear Motors,
Brushes, and Pickup Clamps, 8/01