SANY SY500H, Operation And Maintenance Manual

Page: 129 / 196

MAINTENANCE
5-21 SY500H Excavator OMM
Air Conditioning System
Check the Air Conditioner
0003663
Figure 5-11
CAUTION
The air conditioning system is under pressure.
Working on it could create a hazardous situation,
which could result in injury.
With the engine running, press the air conditioner fan
switch (1) inside the cab to check start-up, airflow,
temperature, and fan speed control. See “Climate Control
Panel” on page 3-10.
Check the Air Conditioner Compressor Belt
1. Prepare the machine for service. See “Maintenance
Safety” on page 2-4.
1. Open the engine access door. See “Engine Access
Door” on page 4-10.
0000749
Figure 5-12
2. Examine the air conditioner compressor belt (1) for
signs of wear or damage.
0003255
Figure 5-13
3. Press on the belt (2) between the compressor pulley
and the drive pulley. The belt should deflect

0.20 in.–0.31 in. (5 mm–8 mm).
NOTE: If using a tension meter to check the belt tension
of the compressor, the tension should measure
143 lbf. (637 N).
4. Adjust belt tension as necessary.
5. Close and secure the engine access door.
Adjust the Air Conditioner Compressor Belt
NOTE: Do not perform any air conditioning system repairs
that are not covered in this manual.
1. Prepare the machine for service. See “Maintenance
Safety” on page 2-4.
2. Open the engine access door. See “Engine Access
Door” on page 4-10.
0000749
Figure 5-14
3. Loosen the upper compressor bracket (1) and lower
compressor bracket (not shown).
4. Check for damaged pulleys, worn V-groove, and
V-belt. Make sure the V-belt does not rub against the
bottom of the V-groove.
5. Move the compressor (2) and its bracket (3) to adjust
the belt tension.
1
1
2
1
2
3