Middleby Marshall Model PS536 - Manual (Page 32)

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ENGLISH
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 6.4mm in length. Be sure to replace the
brushes in exactly the same position.
C. Check the conveyor drive shaft bushings and spacers.
Replace the components if they are worn.
Fig. 4-12 - Key Spare Parts Kit
1
2
3
7
4
5
6
9
10
11
12
12
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 4-11 - Rear panel access
Grease fitting
(1 per
bearing)
8
V. KEY SPARE PARTS KIT - Available sepa-
rately. See Figure 4-12.
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
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
11 3 44701 Fuse, 60A
12 1 45281 Heating Element, 380V 8 kW
13 1 44783 Kit, Digital Temperature Controller
GAS OVENS ONLY:
14 1 36939 Kit, Digital Temperature Controller
15 1 45668 Gas Control Valve
16 1 45669 Ignition Module
17 1 45770 Ignitor
18 1 45771 Flame Probe
19 1 31651 Amplifier Board
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14
15 16
17
Electric Ovens Only
Gas Ovens Only
E. Blower Belt
1. Remove the six screws shown in Figure 4-11. Then,
remove the rear panel from the oven.
2. Check the blower belt for the proper 6.4mm deflection
at the center, and for cracking or excessive wear. See
Figure 4-11. Overtightening the belt will cause prema-
ture bearing failure and possible vibrations. 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 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, shown in Figure 4-11.
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.
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