Domino's Pizza: Middleby Marshall PS636 Gas Oven Quarterly Maintenance Form

Pre-cleaning/service steps

• Switch off the oven and allow it to cool. Do NOT service the oven while it is warm

• Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven

• If it is necessary to move a gas oven for cleaning or servicing, disconnect the gas supply before moving the oven

Quarterly Maintenance Procedure

• Check that the oven is cool and the power is disconnected

• Vacuum both of the blower mounts, and their surrounding compartments, using a shop vacuum

• Tighten all electrical terminal screws

• Remove the conveyor end stop, crumb trays, chain cover, drive chains, end plugs, and conveyor assembly

• Remove the master links from each conveyor belt. Then, roll the belts up the length of the conveyor to remove them from the frame

• Remove the two conveyor adjustment screws from the idler and the conveyor frame

• Remove the idler shaft assembly from the conveyor

• Pull apart the two sections from the idler shaft

• Clean the shafts thoroughly using a rag

• Lubricate both the extended shaft and interior of the hollow shaft using a light food-grade lubricant. DO NOT lubricate the shaft using WD40 or a similar product as this can cause the shafts to wear rapidly

• Before reassembling the shafts into the conveyor frame, check that they are oriented properly

• Reassemble the idler shaft into the conveyor. Make sure that the bronze washer is in place between the two sections of the shaft

• Replace the conveyor adjustment screws to allow the conveyor belt to be reinstalled later do not tighten the screws at this time

• Loosen the set screw on both the conveyor drive sprockets. Then, remove the sprockets from the shaft

• Check the conveyor configuration

• Disassemble and lubricate the two sections of the drive shaft as described for the idler shaft, above.

• Reassemble the drive shaft into the conveyor. Make sure that the bronze washer is in place between the two sections of the shaft.

• Replace the drive sprockets.

• Reassemble the master links onto the conveyor

• Reinstall the end plugs and conveyor onto the oven

• Reattach the drive chains

• Replace the chain cover

• Check the tension of the conveyor belt. The belt should lift about 1'' (25mm). If necessary, adjust the belt tension by turning the conveyor adjustment screws.

• Replace all components onto the oven

Blower Belt

• Remove the six screws shown in Figure 4-7

• Remove the rear panel from the oven

• Check the blower belt for the proper 1/4'' (6mm) deflection at the center and for cracking or excessive wear

• If necessary, adjust the tension of the belt by loosening the four motor mounting bolts. Reposition the motor as necessary until the correct 1/4'' (6mm) deflection is reached, then tighten the bolts