Middleby Marshall Model PS536, Owner'S Operating & Installation Manual

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ENGLISH
V. KEY SPARE PARTS KIT - Available sepa-
rately. See Figure 4-7.
Item Qty. Part No. Description
1 1 44783 Kit, Digital Temperature Controller
2 1 44695 Conveyor Drive Motor w/Pickup Assy.
3 2 30153 Drive Motor Brushes
4 1 37337 Kit, Conveyor Speed Controller
5 1 33985 Kit, Thermocouple
6 1 44687 Motor, Blower
7 1 44685 Belt, Blower
8 1 33983 High Limit Control Module, 230V
9 1 97525 Axial Cooling Fan, 230V
10 1 39530 Air Switch, 230V
ELECTRIC OVENS ONLY:
11 1 44585 Relay and Heat Sink Assembly
12 3 44701 Fuse, 60A
13a 1 43094 Heating Element, 208V 8 kW
13b 1 44800 Heating Element, 230V 8 kW
GAS OVENS ONLY:
14 1 44802 Pilot Assembly
15 1 41647 Modulating Gas Valve, 1/2"
16 1 31651 Amplifier Board
17 1 44801 Combination Gas Control Valve
SECTION 4 - MAINTENANCE
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.
Fig. 4-7 - Key Spare Parts Kit
1
2
3
7
4
5
6
9
10
11
15
12
13
16
17
14
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.
Remove six (6)
screws to remove
rear panel
Blower belt
Bearings
(2 total)
Blower motor
Loosen four (4) screws to adjust
motor position and belt tension
Figure 4-6 - Rear panel access
Grease fitting
(1 per
bearing)
8