3508B Engine for Caterpillar Built Machines Refrigerant Compressor Caterpillar

Illustration 1	g01450547

Displacement per revolution ... 154.9 cc (5.2 oz)

Recommended rpm at rated engine speed ... 2500 ± 200

Rotation of the compressor ... Clockwise

Note: Valve assembly (1) is under pressure when the system is pressurized.

(1) Torque for valve assembly ... 10 ± 2 N·m (90 ± 18 lb in)

(2) Final installation torque with required thread engagement of 15 ± 2 mm (0.6 ± 0.1 inch) ... 35 ± 3 N·m (26 ± 2 lb ft)

(3) Torque for pressure switch ... 8.0 ± 1.5 N·m (70 ± 13 lb in)

(4) Pressure relief valve

Opening pressure ... 3500 to 4100 kPa (510 to 595 psi)

Sealing pressure ... 2900 kPa (420 psi)

V-belt tension

Belt type ... PV8

New V-belt ... 535 ± 22 N (120.3 ± 4.9 lb)

Used V-belt ... 400 ± 44 N (89.9 ± 9.9 lb)

Note: Used belt tension is for a belt that has been operated for at least 30 minutes at the rated speed. Operate the air conditioner for 30 minutes. Then, adjust the tension of the drive belt to 400 N (90 lb). Use a 144-0235 Belt Tension Gauge.

Torque for Fittings

Torque for 7/8 inch threaded fitting ... 25 N·m (220 lb in)

Note: The 7/8 inch threaded fitting is located on the metal tube which has an internal diameter of 15.8 mm (0.62 inch).

Torque for 3/4 inch threaded fitting ... 17 N·m (150 lb in)

Note: The 3/4 inch threaded fitting is located on the metal tube which has an internal diameter of 12.7 mm (0.50 inch).

M10 x 1.5 retaining bolt torque ... 25 ± 7 N·m (220 ± 60 lb in)

Note: The retaining bolt is for the block fitting.

Refrigerant Oil

Oil capacity ... 300 cc (10 oz)

Note: Refer to Systems Operation, "Identifying the Air Conditioning System".

Poly Alkaline Glycol Oil (PAG)

R-134a Refrigerant

DuPont ... SUVA TRANS A/C HFC134a

ICI ... KLEA 134a

Magnetic Clutch

Operating voltage ... 24 VDC

Coil resistance at 20 °C (68 °F) ... 17.6 ± 0.6 Ohms

Minimum voltage for engagement ... 16 VDC

Maximum current at 20 °C (68 °F) ... 1.42 Amp

Power connection ... DT Connector