Middleby Marshall PS500 III. Maintenance Every 3 Months, Split Belt Disassembly and Cleaning

III. MAINTENANCE - EVERY 3 MONTHS

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

B.Vacuum both of the blower motors, and their surrounding compartments, using a shop vacuum.

C.Tighten all electrical control terminal screws.

D.Split Belt Disassembly and Cleaning

For split belt ovens ONLY, disassemble, clean and lubri- cate the conveyor shaft components as described below.

1.Remove the motor shroud, conveyor extensions, and conveyor as described in Part II, Monthly Maintenance.

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

3.Remove the two conveyor adjustment screws from the idler end of the conveyor frame, as shown in Figure 4-

4.Remove the idler shaft assembly from the conveyor.

5.Pull apart the two sections of the idler shaft. Clean the shafts thoroughly using a rag. Then, lubricate both the extended shaft and the interior of the hollow shaft using an FDA-approved light food-grade lubricant.

CAUTION

DO NOT lubricate the shafts using WD40 or a similar product. This can cause the shafts to wear rapidly.

6.Before reassembling the shafts into the conveyor frame, check that they are oriented properly. Remem- ber that unequal-width split belt ovens should AL- WAYS have the narrower belt at the front of the oven.

7.Reassemble the idler shaft into the conveyor. Make sure that the bronze washer is in place between the two sections of the shaft. See Figure 4-7.

8.Replace the conveyor adjustment screws as shown in Figure 4-5. To allow the conveyor belt to be reinstalled later, do not tighten the screws at this time.

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

10.Loosen the locking collar set screw, as shown in Figure 4-6.

11.Push the drive shaft to the right, then lift it free of the conveyor frame. Then, disassemble and lubricate the two sections of the drive shaft as described in Step 5.

12.Before reassembling the shafts into the conveyor frame, check that they are oriented properly. Remem- ber that unequal-width split belt ovens should AL- WAYS have the narrower belt at the front of the oven.

13.Reassemble the drive shaft into the conveyor. Check that the nylon spacer is in place, as shown in Figure 4-

7.Also, check that the bronze washer is in place between the two sections of the shaft.

14.Replace the drive sprockets. Reassemble the belts and master links onto the conveyor, and replace the conveyor in the oven.

15.Reassemble the motor shroud and conveyor exten- sions onto the oven.

SECTION4-MAINTENANCE

16Check the tension of the conveyor belt. The belt should lift between 3-4" (75-100mm). If necessary, adjust the belt tension by turning the conveyor adjustment screws.

Figure 4-5 - Split Belt Idler Shaft	ENGLISH
	Conveyor
	adjustment
	screw

Figure 4-6 - Split Belt Drive Shaft

Locking collar

Figure 4-7 - Washer and Spacer

Bronze washer on

BOTH idler and

drive shafts

Nylon spacer on drive shaft

ONLY

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