Middleby Marshall PS640E IV. MAINTENANCE - EVERY 6 MONTHS, 6. Disassembling the drive shaft

Figure 4-6. Disassembling the drive shaft Figure 4-7. Rear panel access

Bearings

(2 total)

Remove eight (8) screws to remove rear panel

Blower belt

Blower motor

E. Blower Belt

1.Remove the eight screws shown in Figure 4-7. Then, remove the rear panel from the oven.

2.Check the blower belt for the proper 1/4″ (6mm) deflec- tion at the center, and for cracking or excessive wear.

See Figure 4-7. Overtightening the belt will cause premature bearing failure and possible vibrations. A loose belt may also cause vibrations.

3.If necessary, adjust the tension of the belt by loosening

the four motor mounting bolts. Reposition the motor as neccessary until the correct 1/4″ (6mm) deflection is reached, then tighten the bolts.

Loosen four (4) screws to adjust motor position and belt tension

IV. MAINTENANCE - EVERY 6 MONTHS

A.Check that the oven is cool and the power is discon- nected, as described in the warning at the beginning of this Section.

B.Check for excessive wear on the conveyor drive motor

brushes. The brushes should be replaced if they have worn to less than 1/4″ (6mm) in length. Be sure to replace the brushes in exactly the same position.

C.For gas ovens, inspect and clean the burner nozzle and the spark electrode assembly.

D.Check the conveyor drive shaft bushings and spacers. Replace the components if they are worn.

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