SANY SY155U, Operation And Maintenance Manual

Page: 137 / 192

MAINTENANCE
5-27
SY155U Excavator OMM
Heating and Air Conditioning System
Check the Air Conditioning System
While checking the air conditioning system, also check
the following:
NOTE: If any abnormalities are discovered, contact a
SANY dealer. Do not repair the air conditioning
system beyond the tasks described in this
manual.
CAUTION
This system is under pressure. Working on it
could create a hazardous situation, which could
result in injury. Contact a SANY dealer if repairs
are required.
0003663
Figure 5-40
1. Inside the cab, press the A/C power key (1) to turn on
the air conditioning system. Check start-up, air flow
control (3), and fan speed control (2). See “Climate
Control System” on page 3-20.
2. Shut down the engine.
3. Prepare the machine for checks and inspections.
See “Maintenance Safety” on page 2-5.
4. Open the appropriate access covers or compartment
doors. See “Doors, Panels, Covers, and Filler Cap”
on page 4-5.
5. Turn the battery disconnect switch to OFF. See
“Battery Disconnect Switch” on page 3-15.
0003603
Figure 5-41
6. Check the air conditioner condenser (4) for leaks.
0003613
Figure 5-42
7. Check the air conditioner compressor (6) for:
• Refrigerant leaks at the hose and line connections
(5).
• Loose, worn, or twisted drive belt (7).
Air Conditioning System
Assembly/
Component Check(s)
Hose and line
assembly Check the hoses and lines for
cracks and leaks.
Check for loose connections or
loose fasteners.
Connecting
fasteners Check if connection is loose, check
for loose or damaged connecting
fasteners.
Drive belt Check for deterioration due to
heavy wear, scarring, and cracking.
Condenser
assembly Check for blockage by debris
(garbage, dust, grass, etc.).
Refrigerant leak Check for leaks at line and hose
connections.
Noise Check compressor (not under
load).
Check condenser and evaporator
fans.
1
2
3
4
6
5
7