Service Manual User Manual

Electrical System
10-79
Model 3606 • Origin 10/99
10.8.20 Transmission High Temperature Sender
The transmission high temperature sender (Cummins,
Fig. 10– 101 or Perkins, Fig. 10– 98) is threaded into the
transmission housing and is connected via the engine
wiring harness, bulkhead connector and cab wiring har-
ness to the operators display panel (Fig. 10– 99).
When the transmission fluid temperature rises above
250° F (107° C), the sender heats up, closing contacts
within the sending unit. The operators display panel indi-
cator (C, Fig. 10– 99) illuminates and an audible alarm will
sound. When the transmission temperature is below 250°
F (107° C), the contacts within the sending unit open and
the operators display panel indicator and alarm turn OFF.
a. Transmission High Temperature Sender Removal
1. Disconnect the negative (-) battery cable at the
negative battery terminal (Fig. 10– 100).
2. Unplug the wiring harness connector from the sender
(Cummins, Fig. 10– 101 or Perkins, Fig. 10– 98).
3. The sender is threaded into the transmission housing
or case. Remove the sender.
b. Transmission High Temperature Sender
Disassembly
DO NOT disassemble the sender. Replace a defective or
faulty sender with a new one.
c. Transmission High Temperature Sender
Inspection and Replacement
Inspect the sender and the wiring harness connector ter-
minals for continuity. Replace a defective or faulty sender
with a new one.
d. Transmission High Temperature Sender
Installation and Testing
1. Thread the sender (Cummins, Fig. 10– 101 or
Perkins, Fig. 10– 98) into the transmission housing
snugly, then connect the wiring harness connector
lead to the sender.
2. Connect the negative (-) battery cable to its battery
terminal (Fig. 10– 100).
3. Start the engine, allow all systems to reach operating
temperature, and observe the operators display
panel for sender indication. If the sender is not
defective, the problem could be elsewhere; possibly
in a shorted wire, clogged or defective transmission
cooler, defective display, etc.
10.8.21 Engine Coolant
High Temperature Sender
The engine coolant high temperature sender (Cummins,
Fig. 10– 101 or Perkins, Fig. 10– 98) is threaded into the
engine block and is connected via the engine wiring har-
ness, bulkhead connector and cab wiring harness to the
operators display panel.
Figure 10– 101. Cummins engine/transmission senders.
When the engine coolant temperature exceeds normal
limits and rises above 210° F (85° C), the sender heats
up, closing contacts within the sending unit. The opera-
tors display panel indicator (B, Fig. 10– 103) illuminates
and an audible alarm will sound. When the engine cool-
ant temperature is below 210° F (85° C), the contacts
within the sending unit open and the operators display
panel indicator and alarm turn OFF.
MS1760
Engine Coolant
Temperature Sender
Transmission
Temperature Sender
CUMMINS
ENGINE