Operation and maintenance manual

Section 210-0060
SM 1922 Rev 2 11-04
3
Cooling System - Transmission Oil Cooler
1. Clean transmission oil cooler before sludge hardens.
After transmission oil cooler is completely drained,
circulate a solution of Agmasol PS40 through the
cooler core (1) to remove sludge.
2. If cooler tubes are badly clogged, circulate an oakite
or alkaline solution through cooler (1). Solution should
be circulated through cooler (1), in the reverse direction
to normal flow, for approximately 15 minutes, after
soaking for 10 minutes. The duration of circulation
depends on how badly clogged the cooler is. Flush
thoroughly with clean hot water.
Cleaning Water Side
1. Match mark cooler flanges (2 & 3) and heat
exchanger (1) to aid in 'Assembly'.
2. Remove bolts (5) securing water inlet flange (2)
and 'O' ring (4) to heat exchanger (1). Remove water
inlet flange (2) from heat exchanger (1) and discard
'O' ring (4).
3. Remove bolts (5) securing water outlet flange (3)
and 'O' ring (4) to heat exchanger (1). Remove water
outlet flange (3) from heat exchanger (1) and discard 'O'
ring (4).
4. Make up a solution composed of 1/3 muriatic acid
and 2/3 water. To each 9.5 litres (2.5 gal) of solution,
add 227 g (0.5 lb) of oxalic acid.
5. Immerse heat exchanger (1) in the cleaning solution.
Cleaning action is noticeable by bubbling and foaming.
The process must be carefully observed and when
bubbling stops, usually between 30 - 60 sec., remove
heat exchanger (1) from cleaning solution and flush
thoroughly with clean, hot water. After cleaning, dip heat
exchanger (1) in light oil.
Note: Severely fouled cooler tubes can be cleaned by
use of a rotary brush if normal cleaning is not sufficient.
ASSEMBLY
Numbers in parentheses refer to Fig. 2.
Note: Tighten all fasteners to standard torques listed in
Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
1. Install new 'O' ring (4) to water inlet flange (2) and
align flange to heat exchanger (1), as match marked at
'Disassembly'.
2. Secure water inlet flange (2) to heat exchanger (1)
11. Loosen clamps (6) securing hoses (2) to water inlet
pipe (3) and water outlet pipe (4). Slide hoses (2) along
pipes to break connection at cooler flanges.
12. Support oil cooler assembly (1) with suitable lifting
equipment and remove bolts (9) and lockwashers (10)
securing oil cooler assembly (1) to its mounting.
Remove oil cooler assembly (1) from the vehicle.
13. If required, remove nuts, clamps (6) and plate (12)
securing water inlet pipe (3) and water outlet pipe (4)
together.
14. If required, loosen clamps (6) securing elbows (5)
to engine water pump inlet and engine oil cooler inlet
and remove water inlet pipe (3) and water outlet pipe
(4) from the vehicle.
15. If oil inlet line (7) and oil outlet line (8) are to be
replaced proceed as follows.
16. Remove bolts (20) and one half of clamp (17).
Remove split bushings (19) from lines (7 & 8).
17. Disconnect lines (7 & 8) from elbows (13 & 14) and
remove from the vehicle.
18. If required, remove elbows (13 & 14) and 'O' rings
(15) from transmission inlet and outlet ports. Remove
and discard 'O' rings (15).
CLEANING AND DISASSEMBLY
Numbers in parentheses refer to Fig. 2.
In the event of a major mechanical failure, the
transmission oil cooler assembly should be cleaned
thoroughly or replaced. Do not attempt to clean cooler
cores after a transmission failure where metal
particles from worn or broken parts are released into
the oil. Replace the cooler cores.
In many areas, raw water is extremely corrosive or
scale forming and should be treated to prevent
damage to the transmission oil cooler. A properly
maintained cooling system will significantly reduce
cleaning intervals. Refer to Section 210-0000,
COOLING SYSTEM for service intervals and coolant
selection procedures.
Cleaning Oil Side
In the event of a major mechanical failure, the
transmission oil cooler assembly should be cleaned
thoroughly or replaced.