Middleby Marshall PS224 PS310, PS570, PS360, PS200, PS555, PS220 manual Fan shaft alignment tool

SECTION 3 - SERVICING COMPONENTS

5.Early-style PS200 bearing replacement and alignment

NOTE: This procedure is for early-style indirect fan shaft assemblies only, as shown in Figure 25. Bearing replacement procedures for the current-style indirect fan shaft assembly (Figure 26) are provided on Page 72.

IMPORTANT: Before attempting any repair on the early-style PS200 Indirect Fan Drive Assembly:

•If you need to perform any maintenance more involved than replacing and aligning the shaft bear- ings, you should upgrade the fan shaft assembly to the current version.

•Check the front and rear brackets (Item 6 in Fig- ure 32). If the brackets ARE NOT welded to- gether, you should upgrade the fan shaft assem- bly to the current version.

In either of these cases, you can upgrade the fan shaft assembly using Service Kit P/N 49810-0121. See Part Number Reference on Page 68 for details.

The following procedures are necessary to align the fan shaft whenever service to the fan shaft or replace- ment of the bearings is required. REFER TO FIGURE 32 FOR ILLUSTRATIONS OF THE COMPONENTS DE- SCRIBED HERE.

1.Remove the entire back wall (Item 1) of oven to service the fan assembly.

2.Remove the blower fan (Item 13) and pulley (Item 8).

NOTE: If parts are to be replaced, you should replace them now.

3.When installing the Drive Bracket Assembly (Item 5) insert one 3/8” flat washer (Item 4) at the 4 outer holes and one 3/8” special flat washer (Item 14) at the 4 inner holes between bracket and back wall at mounting locations. Use eight 3/8”-16 x 1” screws (Item 2) and assemble a 3/8” lockwasher (Item 3) and a 3/8” flat washer (Item 4) onto each screw. Insert a screw at all 8 locations, hand tighten only at this time.

4.Install front and rear fan shaft flange bearings (Item 10), if they were removed, to Indirect Drive Bracket (Item 6) using three 1/4-20 x 3/4” screws (Item 11) and three 1/4” lockwashers (Item12) on each bear- ing.

IMPORTANT: The bearings (10) must be mounted so the grease fitting faces up when the bracket assembly (Item 5) is mounted on the rear wall.

NOTE: Do not tighten flange bearing block screws until Step 10 has been completed.

9.Install the fan shaft as shown in Figure 32. Align bearing set screws with flats on shaft but do not tighten set screws at this time.

10.Insert fan shaft alignment tool (Item 15) into back

wall as shown in Figure 31. 70

NOTE: The bracket assembly is designed for slight up and down and right to left movement to attain free shaft rotation when the shaft alignment tool is in place. Once free shaft rotation is achieved, tighten all eight bracket screws (Item 2).

11.Tighten rear flange bearing block screws (Item 11) then front flange bearing block screws.

12.Remove shaft alignment tool, then recheck fan shaft for free rotation.

13.Install pulley (Item 8) on fan shaft and position fan shaft per the dimensions shown in Figure 32. Align the two flats per bearing which are machined on fan shaft for the bearing set screws. Use High Temperature Loctite, RC 620 on bearing set screws and then tighten set screws. Recheck fan shaft for free rotation.

14.Apply anti-seize compound on fan shaft before in- stalling fan blade (Item 13). Position fan blade per dimension shown in Figure 32.

15.Apply High Temperature Loctite Type RC 620 to fan blade set screws.

NOTE: Tighten the two set screws on fan blade per the following sequence when viewing fan blade from front: first, the screw at the 12:00 position, then the screw at the 3:00 position.

16.Recheck fan shaft rotation before installing back wall to oven cavity.

NOTE: Apply anti-seize compound (MM P/N 17110- 0017) to all 12 bolts before installing back wall assem- bly to oven.

17.Install back wall on oven.

18.Install fan belt.

NOTE: Excessive fan belt tension will create overload- ing of rear bracket fan shaft bearing. Refer to Blower Belt Tension on Page 69.

Figure 31

Fan shaft alignment tool