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  • AP AIR, INC.
  • 805 13th Street North
  • Humboldt, IA 50548
  • 800-806-5312
  • 1101 Center Street
  • Redding, CA 96001
  • 855-984-8511

CATERPILLAR 621G MOTOR SCRAPER

Model Specifications

Compressor Type R134 Refrigeration (lbs) Compressor Oil (oz) Compressor Oil Viscosity
Sanden4 - 4.4

Belts

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A/C Compressor Belt - 1 Groove, 63.8
9-1690

Compressor V-Belt

174-9030
Belt
TBA 341-4938

Belt

341-4938

Blower Motors

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Blower Speed Resistor - Variable - 12V
220-544

Variable Fan Resistor - 12V

125-9740
Cat Blower Resistor, 3 Spade, 24V
220-5443

Blower Motor Resistor

9G-1950
275-6706 - Blower Motor Assembly - Caterpillar, 24 Volt
BM4052-24

Blower Motor Assembly

275-6706

For Applications with Plastic Housing

5 1/2 Diameter, 5/16 Shaft, CW - Blower Wheel
BW238

Blower Wheel

3E-0400
4 1/2 Diameter Blower Wheel, 5/16 Shaft - Caterpillar
BW240

Blower Wheel

100-3426

Cab Products/Filters

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119-3355 - Cab Air Filter - Caterpillar
320-1193355

Cab Air Filter

119-3355
266-7765 - Cab Air Filter - Caterpillar
320-2667765

Cab Air Filter

259-3222, 266-7765

Compressors

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OE Sanden Compressor SD7H15 - 138mm, 1 Groove Clutch 24V
509-586

OE Sanden Compressor SD7H15 - 138mm, Single Groove Clutch, 24V

3E-1906

Can Use Alternative Sanden - 509-5863

Alternative Compressor SD7H15 - 138mm, 1 Groove Clutch 24V
509-5863

Alternative Compressor SD7H15 - 138mm, Single Groove Clutch, 24 Volt

3E-1906
OE Sanden Compressor SD7H15 - 152mm, 8 Groove Clutch 24V
509-644

OE Sanden Compressor SD7H15 - 152mm, 8 Groove Clutch 24V

183-5106, 185-5106
Alternative Compressor SD7H15 - 152mm, 8 Groove Clutch 24V
509-6443

Alternative Compressor SD7H15 - 152mm, 8 Groove Clutch 24V

183-5106, 185-5106

Condensers

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206-5889 - Caterpillar Condenser
400-9007

Condenser

8N-7486

Evaporators

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157-2523 - Caterpillar Evaporator
590-2525

Evaporator

157-2523
308-9435 - Caterpillar Evaporator
590-2535

Evaporator

308-9435
Evaporator
TBA 275-6701

Evaporator

275-6701
Evaporator
TBA 3E-6257

Evaporator

3E-6257

Expansion Valves

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EC2500-01S - Orifice Tube, Red
905-925

Orifice Tube

7X-2049

Heater Valves

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Water Valve
TBA 239-5535

Water Valve

239-5535

Radiators

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2W5540 - Caterpillar Radiator Core
RC92005

Radiator Core

2W-5540

Folded Core

1093622 - Caterpillar Radiator Core
RC92079

Radiator Core

109-3622

R Series Core

Rec Driers/Accumulators

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2 1/2 x 11 Male O-Ring - Dry-Tech Series
800-137

HD Dry-Tech Series Receiver Drier with Orifice Tube

175-7162
2 1/2 x 11 Male O-Ring
800-1371

Receiver Drier with Orifice Tube - Aftermarket

257-3226, 257-3227, 175-7162
3 1/2 x 9 3/4 Female O-Ring
803-459

Accumulator Without Desiccant - Cat OE Steel

186-6189, 151-5261, 101-8789, 106-1018

Switches/Electrical

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Preset Thermostatic Switch - Caterpillar
210-973

Thermostatic Switch

3E-5464
114-5333 - Binary Pressure Switch Update Kit, Normally Open - Caterpillar
220-10512

Cat Binary Pressure Switch Update Kit

114-5333

Eliminates Pin Connection at Pressure Switch
Solid Pin Connector on Harness

114-5333 - Cat Binary Pressure Switch, Normally Open with Aftermarket Wire Harness
220-1052

Binary Switch with Aftermarket Wire Harness and Connector

114-5333

Includes Aftermarket Wire Harness
For Switch Only Order a 220-1051

114-5333 - Cat Binary Pressure Switch, Normally Open with OE Wire Harness and Connector with Solid Pins
220-1052HD

Binary Pressure Switch with HD OE Wire Harness and Connector

114-5333

Includes Heavy Duty OE Wire Harness
For Switch Only Order a 220-1051

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