318B Excavator Machine System Specifications Caterpillar

Illustration 1	g00275320

Bench Test Specification

At the following pressure settings, measure the output flow.

Output flow ... 130 ± 3 L/min (34.3 ± 0.8 US gpm)

Pump delivery pressure ... 7850 kPa (1140 psi)

Power shift pressure ... 1160 ± 50 kPa (170 ± 7 psi)

Pump speed ... 2700 rpm

Output flow ... 138 ± 8 L/min (36.5 ± 2.1 US gpm)

Pump delivery pressure ... 16700 kPa (2400 psi)

Power shift pressure ... 1160 ± 50 kPa (170 ± 7 psi)

Pump speed ... 2200 rpm

Note: For complete hydraulic pump performance, refer to Testing and Adjusting, RENR1957, "Pump Flow Tests".

(1) Torque for two nuts ... 16 ± 2 N·m (12 ± 1 lb ft)

(2) Torque for four bolts ... 29 ± 2 N·m (21 ± 1 lb ft)

(3) Torque for 12 bolts ... 12 ± 1.5 N·m (9 ± 1 lb ft)

(4) 5I-8811 Spring

Free length ... 26.0 mm (1.024 inch)

Outside diameter ... 23.1 mm (0.909 inch)

(5) 5I-8810 Spring

Free length ... 35.2 mm (1.386 inch)

Outside diameter ... 15.4 mm (0.606 inch)

(6) 129-7972 Spring

Free length ... 27.6 mm (1.087 inch)

Outside diameter ... 17.4 mm (0.685 inch)

(7) 129-7971 Spring

Free length ... 43.4 mm (1.709 inch)

Outside diameter ... 29.5 mm (1.161 inch)

(8) Torque for nut ... 155 ± 20 N·m (115 ± 15 lb ft)

(9) Torque for four nuts ... 175 ± 30 N·m (130 ± 22 lb ft)

(10) Torque for four bolts ... 12 ± 1 N·m (9 ± 1 lb ft)

(11) 5I-8757 Spring

Free length ... 31.3 mm (1.232 inch)

Outside diameter ... 7.7 mm (0.303 inch)

(12) Torque for adapter ... 110 ± 10 N·m (80 ±7 lb ft)

(13) Torque for four bolts ... 12 ± 1 N·m (9 ± 1 lb ft)

(14) Apply 5P-3413 Pipe Sealant on the seal.

(15) Torque for three plugs ... 110 ± 10 N·m (80 ± 7 lb ft)

(16) Torque for eight bolts ... 235 ± 20 N·m (175 ± 15 lb ft)

Pilot Pump

Part of the Main Pump

Illustration 2	g00288514

Type of pump ... Gear

At the following pressure, measure the output flow.

Output flow ... 20 kPa (2.9 psi)

Pump delivery pressure ... 4100 kPa (595 psi)

Pump speed ... 2200 rpm