An Improved Resistor is Used for the Heater and Air Conditioner on Certain D3K2, D4K2, and D5K2 Track-Type Tractors {7304, 7320} Caterpillar

An Improved Resistor is Used for the Heater and Air Conditioner on Certain D3K2, D4K2, and D5K2 Track-Type Tractors {7304, 7320}

Usage:

D3K2 XL FT3

Track-Type Tractor: D3K2 (S/N: KF21-UP; KL21-UP; FT31-UP; LT31-UP; JPJ1-UP); D4K2 (S/N: KM21-UP; KR21-UP; MT31-UP; RT31-UP); D5K2 (S/N: KW21-UP; KY21-UP; WT31-UP; YT31-UP; RRE1-UP)

Description Of Change: A new resistor with an improved thermal fuse is now used for the heater and air conditioner on certain D3K2, D4K2, and D5K2 Track-Type Tractors.

Adaptable To:

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Illustration 1	g06030069

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Table 1
Required Parts
Item	Qty	New Part Number	Description	Former Part Number
1	1	491-0681	Resistor	449-1517

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Table 2
Sales Model	Adaptable to	Effective with
D3K 2 LGP	S/N:JPJ1-200	S/N:JPJ201-UP
	S/N:KL21-241	S/N:KL2242-UP
	S/N:LT31-113	S/N:LT3114-UP
D3K 2 XL	S/N:FT31-102	S/N:FT3103-UP
D3K 2 XL	S/N:KF21-188	S/N:KF2189-UP
D4K 2 LGP	S/N:KR21-240	S/N:KR2241-UP
D4K 2 LGP	S/N:RT31-130	S/N:RT3131-UP
D4K 2 XL	S/N:KM21-222	S/N:KM2223-UP
D4K 2 XL	S/N:MT31-119	S/N:MT3120-UP
D5K 2 LGP	S/N:KY21-467	S/N:KY2468-UP
	S/N:RRE1-236	S/N:RRE237-UP
	S/N:YT31-153	S/N:YT3154-UP
D5K 2 XL	S/N:KW21-352	S/N:KW2353-UP
D5K 2 XL	S/N:WT31-146	S/N:WT3147-UP

The new resistor is adaptable to machines and effective and in production with the machines listed in Table 2.

Installation Procedure

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Illustration 2	g06030406

For better clearance to remove the resistor, slide seat (B) to maximum rear position.
Move armrest (C) to forward and up.
Remove two bolts (D) from each side. Save bolts for later use. Slide seat to the right. Refer to Illustration 2.
Remove recirculation air filter. Save filter for later use.
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Illustration 3 g03874174

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Illustration 4 g03874946

Detailed view of area G
Old resistor is identified by green lettering and gray cone-like end shown in circled area
Remove two Phillips screws (E) and disconnect two terminals (F). Save the part. Refer to Illustration 3.
Remove 449-1517 Resistor (A). Discard the part.
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Illustration 5 g03874180

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Illustration 6 g03874959

Detailed view of area H
New resistor is identified by pink lettering and black cone-like end shown in circled area
Install new 491-0681 Resistor (1).
Secure two Phillips screws (E) and connect two terminals (F) that were saved in Step 5. Refer to Illustration 5.
Replace air recirculation filter that was previously removed and saved in Step 4.
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Illustration 7 g03874182
Install four bolts (D) to hold seat in place that were saved in Step 3. Refer to Illustration 7.
Place slide seat (B) and armrest (C) to the original position.