Middleby Marshall PS53GS Gas manual Disassembling the idler shaft

SECTION 4 - 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-
	4.
4.	Remove the idler shaft assembly from the conveyor.
5.	Pull apart the two sections of the idler shaft.
6.	Clean the shafts thoroughly using a rag. Then, lubri-
	cate both the extended shaft and the interior of the
	hollow shaft using a light food-grade lubricant. DO
	NOT lubricate the shafts using WD40 or a similar
	product. This can cause the shafts to wear rapidly.
7.	Before reassembling the shafts into the conveyor
	frame, check that they are oriented properly.

Figure 4-4 - Disassembling the idler shaft

Disassemble,

clean, and

lubricate shafts

Bronze washer

8. 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 4-4.

Remove

Remove

idler shaft assembly

9. Replace the conveyor adjustment screws as shown in
	Figure 4-4. To allow the conveyor belt to be reinstalled
	later, do not tighten the screws at this time.
10.	Loosen the set screw on both of the conveyor drive
	sprockets. Then, remove the sprockets from the shaft.
11.	Check the conveyor configuration as follows:
	•	High-speed conveyors are equipped with large
		flange bearings at both ends of the shaft, as
		shown in Figure 4-5. For these conveyors, re-
		move the two screws that hold each bearing to the
		conveyor frame. With the screws removed, lift the
		end of the shaft at the front of the oven, and pull the
		entire assembly free of the conveyor frame.
	•	Standard conveyors are equipped with bronze
		bushings mounted on spacers at both ends of the
		shaft, as shown in Figure 4-5. For these convey-
		ors, remove the two screws that hold the bracket
		to the conveyor frame. With the screws removed,
		lift the end of the shaft at the front of the oven, and
		pull the entire assembly free of the conveyor
		frame. The brackets will be removed along with
		the drive shaft assembly.
12.	Disassemble and lubricate the two sections of the
	drive shaft as described for the idler shaft, above.
13.	Before reassembling the shafts into the conveyor
	frame, check that they are oriented properly.
14.	Reassemble the drive shaft into the conveyor. Make
	sure that the bronze washer is in place between the
	two sections of the shaft. See Figure 4-6.
15.	Replace the drive sprockets. Reassemble the belts
	and master links onto the conveyor.
16.	Reinstall the end plugs and conveyor onto the oven.
17.	Reattach the drive chains. Replace the chain cover.

18Check the tension of the conveyor belt as shown in Figure 2-11 (in Section 2, Installation). The belt should lift about 1" (25mm). If necessary, adjust the belt tension by turning the conveyor adjustment screws.

19. Replace all components onto the oven.

adjustment

screws

Figure 4-5 - Drive shaft configurations

Flange bearing	Bronze bushing with
(used with high-	spacer (used with
speed conveyors)	standard conveyors)

Figure 4-6 - Disassembling the drive shaft

Disassemble,

clean, and

lubricate shafts

Flange bearing

shown (used with

high-speed conveyors)

Loosen set screws and remove drive sprockets

Remove 2 screws and nuts per side to free bearings/brackets

21