308C CR Excavator Hydraulic System – Main Hydraulic Pump



Illustration 1 g00739506


NOTICE

All pump lines and pump housing must be filled with oil prior to start-up. Failure to provide proper oil fill may result in system damage.


The following values are Bench Test Specifications.

(1) Torque for plug … 36 ± 5 N·m (27 ± 4 lb ft)

(2) Main Pump

Type of pump … Axial piston (variable displacement)
Output flow … 64 ± 5 L/min (17 ± 1.3 US gpm)
Pump delivery pressure … 7350 ± 490 kPa (1075 ± 72 psi)
Power Up Switch … ON
Pump speed … 2100 rpm
Output flow … 52 ± 5 L/min (14 ± 1.3 US gpm)
Pump pressure … 13700 ± 490 kPa (1975 ± 72 psi)
Power Up Switch … ON
Pump speed … 2100 rpm

(3) Blade Pump

Type of pump … Gear
Output flow … 30 L/min (7.9 US gpm)
Pump pressure … 20600 ± 490 kPa (3000 ± 72 psi)
Pump speed … 2100 rpm

(4) Pilot Pump

Type of pump … Gear
Output flow … 17 L/min (4.5 US gpm)
Pump pressure … 4100 ± 200 kPa (595 ± 29 psi)
Pump speed … 2100 rpm

(5) Torque for two bolts … 62 ± 7 N·m (46 ± 5 lb ft)

(6) Torque for nut … 240 ± 20 N·m (175 ± 15 lb ft)

(7) Torque for five bolts … 165 ± 15 N·m (120 ± 11 lb ft)

(8) Torque for two bolts … 62 ± 7 N·m (46 ± 5 lb ft)

(9) Torque for four bolts … 32 ± 4 N·m (24 ± 3 lb ft)

(10) 143-8039 Spring

Free length … 134.0 mm (5.28 inch)
Outside diameter … 41.0 mm (1.61 inch)

(11) 127-0055 Spring

Free length … 86.5 mm (3.40 inch)
Outside diameter … 28.0 mm (1.10 inch)

(12) Torque for four bolts … 62 ± 7 N·m (46 ± 5 lb ft)

(13) Torque for plug … 36 ± 5 N·m (27 ± 4 lb ft)

(14) 188-4114 Spring

Free length … 15.5 mm (0.61 inch)
Outside diameter … 8.9 mm (0.35 inch)

(15) 107-6879 Spring

Free length … 60.00 mm (2.36 inch)
Outside diameter … 44.5 mm (1.75 inch)

(16) Torque for four bolts … 14 ± 2 N·m (10 ± 1 lb ft)

(17) Torque for two bolts … 62 ± 7 N·m (46 ± 5 lb ft)

(18) Torque for three bolts … 32 ± 4 N·m (24 ± 3 lb ft)

(19) Torque for four bolts … 32 ± 4 N·m (24 ± 3 lb ft)

(20) Torque for two bolts … 32 ± 4 N·m (24 ± 3 lb ft)

(21) Torque for orifice … 1.8 ± 0.2 N·m (16 ± 2 lb in)