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

3 steps

The Domino's Pizza: Middleby Marshall PS636 Gas Oven Quarterly Maintenance Form ensures that your equipment performs at its best all the time by providing a complete and detailed set of procedures for the quarterly maintenance. It also has a few and easy pre-cleaning steps.

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

Source: Middleby Marshall

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