Lube Oil Filter; Servicing The Low Coolant Sensor (Option); Servicing Low Oil Pressure Switch; Engine Speed - Carrier TRANSICOLD 69UG15 Series Operation And Service

d. Run engine 6 to 12 hours and drain system while
warm. Rinse system three times after it has cooled
down. Refill system with water.
CAUTION
Use only ethylene glycol, anti-freeze (with
inhibitors) in system. Use of glycol by itself
will damage the cooling system (Refer to
paragraph 1.10.k.).
e. Run engine to operating temperature. Drain system
again and fill with treated water/anti-freeze (see
above Caution note).

4.4.6 Lube Oil Filter

The primary oil filter is located near the radiator fan (see
Figure 1-5).
1. After warming up the engine, stop engine, remove
drain plug from oil reservoir and drain engine lube oil.
2. Replace filters. Lightly oil gasket on filter before
installing.
3. Add lube oil (Refer to paragraph 1.10.f.).
4. Warm up engine and check for leaks.

4.4.7 Servicing the Low Coolant Sensor (Option)

a. Testing the Low Coolant Sensor (LCS)
1. Verify the coolant level is correct.
2. Verify the wiring to the sensor is correct.
3. Check voltage (12.5 to 13.5 VDC) to the B terminal
with the ignition switch on (see Figure 4-2).
4. Check continuity between terminals A and C (see
Figure 4-2) while 12 VDC is applied to terminal B.
5. Drain the coolant from the system to below the level
of the coolant sensor and remove the sensor as de-
scribed in Section 4.4.7.b., steps 1 and 2 below.
6. With the sensor removed from the radiator and 12
VDC applied to terminal B, the circuit between termi-
nals A and C should be open.

Figure 4-2 Low Coolant Sensor

T-343
Never open the radiator cap when the cool-
ant is hot.
b. Replacing the Low Coolant Sensor (LCS)
1. Loosen the radiator drain pet cock and drain coolant
to a point below the sensor into an approved contain-
er.
2. Unplug the harness and remove sensor from radia-
tor header.
3. Apply Teflon thread tape or thread sealer to the LCS
threads and install sensor.
4. Reconnect the harness and refill the radiator to prop-
er level.

4.4.8 Servicing Low Oil Pressure Switch

a. Remove harness connection from low oil pressure
switch (LOP).
b. Remove pressure switch from engine.
c. Apply Teflon thread sealer to threads of new low oil
pressure switch.
d. Install new low oil pressure switch.
e. Reconnect harness connection to low oil pressure
switch.

4.4.9 Engine Speed

The engine speed is electronically controlled. DO NOT
ATTEMPT TO ADJUST ENGINE SPEED.

4.4.10 Replacing the Engine Speed Sensor

a. Disconnect the plug to the sensor, (see Figure 1-1).
b. Remove the bolt securing the sensor to the housing.
c. Remove the sensor from the housing.
d. Clean the recess in the housing to ensure that the
sensor seats properly when re-installed.
e. Re-install by sensor, replace the securing bolt and
connect the plug to the sensor.
4−2
CAUTION