MacDon M155 Operators Manual - Manual (Page 340)

MAINTENANCE AND SERVICING
1. Shut down the engine and remove the key.
2. Open the LH platform. Refer to 5.5.1 Opening
Platforms (Standard Position), page 269 .
3. Open the hood. Refer to 5.4.1 Opening Hood (Lower
Position), page 266 .
4. Loosen compressor mounting hardware (B) and push
compressor towards engine to release tension.
5. Remove belt (A) from compressor.
Figure 5.121: A/C Compressor
6. Insert the drive end of a 1/2 in. drive ratchet wrench
into the belt tensioner (B).
7. Rotate tensioner counterclockwise until fan belt (C)
can be slipped off pulley (D). Release tensioner and
remove wrench.
8. Remove belt in order 1–2–3 as shown. Route fan belt
around fan and remove belt.
9. Install new belt (C) around fan and onto pulleys in
order 3–2–1.
10. Insert the drive end of a 1/2 in. drive ratchet wrench
into the belt tensioner (C).
11. Rotate tensioner counterclockwise until belt (C) can
be slipped onto pulley (D). Release tensioner and
remove wrench.
12. Check that belt is properly seated in all pulley grooves.
Figure 5.122: Engine Belts
A - A/C Compressor Belt B - Belt Tensioner
C - Fan Belt D - Pulley
13. Install new compressor belt (A).
14. Pry compressor away from engine so that a force of
8–12 ft·lbf (35–55 N·m) deflects the belt (A) 3/16 in.
(5 mm) at mid-span.
15. Tighten compressor mounting hardware (B).
16. Recheck tension and readjust as required.
17. Close the hood. Refer to 5.4.2 Closing Hood (Lower
Position), page 267 .
18. Close the platform. Refer to 5.5.2 Closing Platforms
(Standard Position), page 270 .
Figure 5.123: A/C Compressor
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