Takeuchi TB175W, Руководство по ремонту

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III-63 TB175W
B. Turn the AC System On – This will power the thermostat and
clutch. If it does not come on, use the AC mode switch to check the
leads to the switch. You should be able to hear a “click” from the ther-
mostat and hear the clutch drive plate “snap” against the clutch pul-
ley. You can not check thermostat cycling on and off until you do the
performance inspection. Figure 7-5 illustrates a typical AC electrical
system and the places you should inspect.
C. Check Fuses – If there is a failure and you have made sure all con-
nections are clean and tight, you need to check fuses—in-cab as well as
in-line.
D. Check Clutch Engagement – Since you can’t see and may not hear
the clutch engage, get out and look at the clutch. If it’s engaged, you
will see that the drive plate is against the pulley and not slightly spaced
from it. If you are not sure the clutch is engaged, look for the lead wire
connector near the clutch. Break and close that connection. The clutch
will disengage and engage again.
E. Test Blower Speed Operation – Some systems have a common
switch that turns on the air conditioner and powers the blower motor.
Test blower speed operation by adjusting this or the separate blower
control switch. Feeling the air flow from the ducts or note blower
sound (speed) changes.
F. Inspect Roof Mounted Condensers – Don’t forget to inspect roof
mounted condensers and AC systems for dirt and debris. Be sure the
condenser fan(s) are working properly and all parts and electrical con-
nections are securely fastened. The roof mounted condenser fans may
come on when the system is turned on. Like the thermostat and most
clutches, the normal on-off cycling action can not be observed until the
engine is running with the AC system on.
Inspection & Maintenance
Figure 7-5
The electrical system inspec-
tion points are noted with
check marks (
✔
) on this
wiring diagram (electrical
schematic).