Middleby Marshall Model PS536 English, E. Blower Belt, F. Lubricating the Blower Fan Bearings

ENGLISH

SECTION4-MAINTENANCE

E.Blower Belt

1.Remove the six screws shown in Figure 4-6. Then, remove the rear panel from the oven.

2.Check the blower belt for the proper 1/4" (6.4mm) deflection at the center, and for cracking or excessive wear. See Figure 4-6. Overtightening the belt will cause premature bearing failure and possible vibra- tions. 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" (6.4mm) deflection is reached, then tighten the bolts.

F.Lubricating the Blower Fan Bearings

1.Use a grease gun to lubricate the main blower fan shaft bearings, as shown in Figure 4-6.

When lubricating the bearings:

•Use a high-quality NLGI #2, lithium soap grease with petroleum oil, such as Middleby P/N 17110-0015.

•Add the grease slowly until a small bead of grease is present at the seals. AVOID OVERGREASING. Excessive greasing may cause harm to the bearing.

2.Manually turn the blower shaft by pulling on the belt to purge the grease. Wipe off any excess grease.

3.Replace the rear panel onto the oven.

IV. MAINTENANCE - EVERY 6 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.Check for excessive wear on the conveyor drive motor brushes. The brushes should be replaced if they have worn to less than 1/4" (6.4mm) 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.

Figure 4-6 - Rear panel access

Remove six (6)

screws to remove

rear panel

Bearings (2 total)

Grease fitting

(1 per

bearing)

Blower belt

Blower motor

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

Fig. 4-7 - Key Spare Parts Kit

1 2

3

4

V. KEY SPARE PARTS KIT - Available sepa- rately. See Figure 4-7.

Item	Qty.	Part No.	Description
1	1	44695	Conveyor Drive Motor w/Pickup Assy.
2	2	30153	Drive Motor Brushes
3	1	37337	Kit, Conveyor Speed Controller
4	1	33985	Kit, Thermocouple
5	1	44687	Motor, Blower

5	6	7
			8

6	1	44685	Belt, Blower
7	1	33983	High Limit Control Module, 230V
8	1	97525	Axial Cooling Fan, 230V
9	1	39530	Air Switch, 230V
ELECTRIC OVENS ONLY:
10	1	44585	Relay and Heat Sink Assembly

9

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11

11a	1	43094	Heating Element, 208V 8 kW
11b	1	44800	Heating Element, 230V 8 kW
11c	1	45281	Heating Element, 380V 8 kW
12	3	44701	Fuse, 60A
13	1	44783	Kit, Digital Temperature Controller
GAS OVENS ONLY:
14	1	36939	Kit, Digital Temperature Controller
15	1	44802	Pilot Assembly
16	1	41647	Modulating Gas Valve, 1/2"
17	1	31651	Amplifier Board
18	1	44801	Combination Gas Control Valve	24

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