Kubota M5040, Workshop Manual

Page: 509 / 559

10-S1
M5040, M6040, M7040, WSM CABIN
1. TROUBLESHOOTING
COMPRESSOR
W1013580
AIR CONDITIONING SYSTEM
W1013718
Symptom Probable Cause Solution
Reference
Page
Noisy
(Compressor ON) Bearing of compressor worn or damaged Replace 10-S39, 40
Valves in compressor damaged Replace 10-S39, 40
Belt slipping Adjust or replace G-24
Compressor bracket mounting screws loosen Tighten –
Piping resonant Tighten or add clamp –
Noisy
(Compressor OFF) Blower defective Repair or replace 10-S27
Bearings of magnetic clutch, idle pulley or crank
pulley worn or damaged Replace 10-S22
Does Not Cool
(No Air Flow) Fuse blown Replace –
A/C main relay defective Replace 9-S36
A/C blower motor defective Replace 10-S27
A/C blower switch defective Replace 10-S24
Wiring harness disconnected or improperly
connected Repair –
Does Not Cool
(Compressor Does
Not Rotate) Fuse blown Replace –
Magnetic clutch defective Repair or replace 10-S22
A/C switch defective Replace 10-S25
Pressure switch defective Replace 10-S29
Belt slipping Adjust or replace G-24
Does Not Cool
(Others) Insufficient refrigerant Check with manifold
gauge 10-S21
Expansion valve defective Replace –
Compressor defective Replace 10-S38
Insufficient Cooling
(Insufficient Air
Flow) Air filter clogged Clean or replace G-29
Evaporator frosted Clean or replace
thermo switch –
A/C blower motor defective Replace 10-S27
A/C blower resistor defective Replace 10-S27
Insufficient Cooling
(Many Bubbles in
Sight Glass) Insufficient refrigerant Check with manifold
gauge 10-S21
Gas leaking from some place in refrigerating
cycle Repair and charge
refrigerant 10-S13
Air mixed in Check with manifold
gauge 10-S15
Insufficient Cooling
(No Bubbles in Sight
Glass) Too much refrigerant Check with manifold
gauge 10-S21
KiSC issued 06, 2008 A