PUMP & MTG GP-MAIN HYDRAULIC 2797721 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until that time, use the interim solution that is identified below.Problem
Illustration 1 g03871028
The 449-1517 Resistor (A) in the heater and air conditioner group may fail on the machines listed above. This failure may induce blower motor to operate at high speed only.Solution
Until a permanent solution is identified, replace the 449-1517 Resistor with upgraded part 491-0681 Resistor .Resistor access is via the cab recirculation air filter area.Rework Procedure
Illustration 2 g03873790
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 the part. Slide seat to the right. Refer to Illustration 2.
Remove recirculation air filter.
Illustration 3 g03874174
Illustration 4 g03874946
Detailed view of area GOld Resistor with thermal fuse failure
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.
Illustration 5 g03874180
Illustration 6 g03874959
Detailed view of area HResistor with new thermal fuse
Install new 491-0681 Resistor (1) .
Secure two Phillips screws (E) and connect two terminals (F) that were saved in Step 4. Refer to Illustration 5.
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 its original position.The new 491-0681 Resistor is not currently available in the Morton Parts System. The Small Track-type Tractor Product Support Group has a limited number of new resistors ready for immediate distribution. Only in a case of failure of the 449-1517 Resistor , please contact "Joel Denning" at 919-550-1434, dennijt or "John Phelan" at 919-550-1497, phelan_john to request a new resistor.