Middleby Marshall PS360WB-U - Manual (Page 21)

21
ENGLISH
SECTION 4 - MAINTENANCE
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. Check the tension of the conveyor belt as shown in Figure 4-5. The
belt should lift between 75-100mm. If necessary, adjust the belt
tension by turning the conveyor adjustment screws.
Figure 4-6 - Split Belt Idler Shaft
Figure 4-7 - Split Belt Drive Shaft
Figure 4-8 - Washer and Spacer
Conveyor
adjustment
screw
Locking collar
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