Service manual

BOSS® DIAGNOSTIC TOOL
Procedure
The tool listed will be needed to do the following
procedure:
MEL1400 – Diagnostic Tool
Stop the engine.
Lift and block the loader. (See Page 1–1.)
Remove the dust cap from the diagnostic connector plug.
Connect the diagnostic tool plug (Item 1) [A] into the
loader connector.
Use the instructions from the BOSS Operation &
Maintenance Manual to make service checks of BOSS
system operating unit and other components [A].
SENDER AND SENSOR
Service Checks
Use the following information when checking the senders
and sensor with a volt/ohmmeter:
Component Value
TEMPERATURE SENDER
70 degree F. (21 degree C.) 970 ohms. . . . . . . . . . . . .
80 degree F. (27 degree C.) 1013 ohms. . . . . . . . . . . .
ENGINE OIL PRESSURE SENDER
0 PSI 3 ohms Max.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 PSI (41 kPa) 7 ohms Min.. . . . . . . . . . . . . . . . . . . . . . .
50 PSI (345 kPa) 49 ohms. . . . . . . . . . . . . . . . . . . . . . . .
70 PSI (483 kPa) 59 ohms. . . . . . . . . . . . . . . . . . . . . . . .
TRANSMISSION CHARGE PRESSURE SENDER
0 PSI 0–5 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100 PSI (690 kPa) 58 ohms. . . . . . . . . . . . . . . . . . . . . . .
130 PSI (896 kPa) 75 ohms. . . . . . . . . . . . . . . . . . . . . . .
150 PSI (1034 kPa) 87 ohms. . . . . . . . . . . . . . . . . . . . .
FUEL SENDER
Full 30 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Empty 270 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE: Early S/N loaders have the diagnostic plug
located at rear window as shown in Fig. [B].
A
P–03871
1
853,853H Loader
–8–3– Service Manual
B
CD–09025