III. Maintenance Every 3 Months | Middleby Marshall PS360-U instruction

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 lubricate the conveyor shaft components as described below.

1.Remove the motor shroud, conveyor extensions, and con- veyor 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 4-6.

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. Remember that unequal-width split belt ovens should ALWAYS 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 4-8.

8.Replace the conveyor adjustment screws as shown in Figure 4-6. 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 sprock- ets. Then, remove the sprockets from the shaft.

10.Loosen the locking collar set screw, as shown in Figure 4-7.

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. Remember that unequal-width split belt ovens should ALWAYS 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 4-8. 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. Check that the smooth side of the conveyor belt faces UP, and that the belt and master links are oriented as shown in Figure 4-9.

15.Reassemble the conveyor, motor shroud and conveyor extensions onto the oven.

16.CheckthetensionoftheconveyorbeltasshowninFigure4-5. The belt should lift between 75-100mm. If necessary, adjust the belt tension by turning the conveyor adjustment screws.

SECTION4-MAINTENANCE

Figure 4-6 - Split Belt Idler Shaft

Conveyor adjustment screw

ENGLISH

Figure 4-7 - Split Belt Drive Shaft

Locking collar

Figure 4-8 - Washer and Spacer

Bronze washer on

BOTH idler and

drive shafts

Nylon spacer on drive shaft

ONLY

Figure 4-9 - Conveyor and Master Link Orientation

Direction

of travel

CORRECT master link position

Incorrect

master link

position