Middleby Marshall PS570S - Manual (Page 20)

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ENGLISH
E. Blower Belts
1. To gain access to each blower belt compartment,
remove the four screws shown in Figure 4-11. Then,
lift the rear shroud off its hangers.
2. Check each blower belt for at least 1" (25mm) deflec-
tion at the center, and for cracking or excessive wear.
See Figure 4-12. Overtightening the belt will cause
premature bearing failure and possible 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 deflection is reached,
then tighten the motor mounting bolts.
F. Lubricating the Blower Fan Bearings
1. Use a grease gun to lubricate the main blower fan shaft
bearings, as shown in Figure 4-13.
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 harm the bearing.
2. Manually turn the blower shaft by pulling on the belt to
purge the grease.
3. Wipe off any excess grease on the bearings. Then,
replace the shrouds onto the oven.
NOTE
The oven will not operate unless both of the rear shrouds
are in place.
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. Clean and inspect the burner nozzle and electrode assem-
bly.
D. Check (and clean, if necessary) the oven venting system.
E. Check the conveyor drive shaft bushings and spacers.
Replace the components if they are worn.
Figure 4-13 - Lubricating the Bearings
At least 1" (25mm)
deflection
Grease fittings
(1 per bearing, 4
total)
Figure 4-12 - Fan Belt Tension
Figure 4-11 - Rear Shrouds
Screws
(2 per shroud)
Screws
(2 per fan cover)
SECTION 4 - MAINTENANCE