2015/09/25 Caterpillar

Articulated Truck

735B (S/N: T4P1-UP; E4R1-UP)

735C (S/N: TFJ1-UP)

740B (S/N: T4R1-UP; E4S1-UP)

745C (S/N: TFK1-UP)

Ejector Truck

740B EJECTOR (S/N: T4S1-UP)

740C EJECTOR (S/N: TFN1-UP)

Excavator

374F (S/N: DNM1-UP)

390F (S/N: TYE1-UP; MGF1-UP; HSM1-UP)

Mobile Hydraulic Power Unit

374F MHPU (S/N: DP41-UP)

390F MHPU (S/N: PT71-UP)

OEM Mobile Hydraulic Power Unit

390F MHPU (S/N: B371-UP)

Reclaimer Mixer

RM500B (S/N: MB91-UP)

Wheel Loader

988K (S/N: TWX1-UP)

Description Of Change: The new NRS cooler assembly has improved coolant flow to resist thermal fatigue.

Adaptable To: The new 436-9149 Cooler As replaces the existing 436-9150 Cooler As. The new cooler assembly is adaptable back to first production on the serial numbers listed above.

Refer to Table 1 for a list of part numbers needed to install the new NRS cooler.

Table 1

New Part Number	Description	Quantity
0S-1615	Bolt	2
4F-7391	O-Ring Seal	1
7L-6580	O-Ring Seal	2
8T-9588	O-Ring Seal	1
9N-5085	Clamp	3
118-7214	O-Ring Seal	2
324-9290	Bellows As	1
344-2636	Clamp As	4
436-9149	Cooler As	1
442-7347	Elbow	1
444-3516	Tube	1
444-3517	Tube As	1
445-6881	Hose	1
450-2351	Band Clamp	2

This change is effective for the serial numbers listed in Table 2.

Table 2

Effective Serial Numbers

S/N:DNM00359-UP

S/N:DP400103-UP

S/N:HSM00307-UP

S/N:TYE00224-UP

S/N:MGF00265-UP

S/N:B3700103-UP

S/N:PT700002-UP

S/N:T4P00491-UP

S/N:E4R00002-UP

S/N:TFJ00180-UP

S/N:T4R03303-UP

S/N:T4S00384-UP

S/N:E4S00140-UP

S/N:TFN00174-UP

S/N:TFK00739-UP

S/N:TWX00812-UP

S/N:MB900127-UP

Refer to Special Instruction, REHS7798, "Procedure for Removing and Installing the Exhaust Cooler (NRS) on All Tier 4 C15 and C18 Engines" for additional information.

Note: A new 324-9290 Bellows As and two new 9N-5085 Clamp will be installed on the exhaust inlet side of the NRS cooler. A new 9N-5085 Clamp will be installed on the exhaust outlet side of the NRS cooler.

Refer to Special Instruction, REHS7798, "Procedure for Removing and Installing the Exhaust Cooler (NRS) on All Tier 4 C15 and C18 Engines" for additional information.

Note: A new 324-9290 Bellows As and two new 9N-5085 Clamp will be installed on the exhaust inlet side of the NRS cooler. A new 9N-5085 Clamp will be installed on the exhaust outlet side of the NRS cooler.

When refilling the engine coolant, be sure to get all the air out of the system to protect the NRS Cooler. The preferred coolant refill method is to vacuum fill. If the vacuum fill method is not an option, run engine at idle without pressure cap installed not allowing the system to pressurize.

Note: Make sure that the pressure cap is reinstalled after air has purged out. Do not run engine this way for an extended amount of time.

Illustration 1	g03847836
(1) 436-9149 Cooler As (2) 344-2636 Clamp As

Illustration 2	g03895722
(3) 7L-6580 O-Ring Seal (4) 444-3517 Tube As (5) 450-2351 Band Clamp (6) 118-7214 O-Ring Seal (7) 444-3516 Tube (8) 445-6881 Hose (9) 4F-7391 O-Ring Seal

Illustration 3	g03895724
(6) 118-7214 O-Ring Seal (10) 8T-9588 O-Ring Seal (11) 442-7347 Elbow