953C Track-Type Loader Power Train Caterpillar

Illustration 1	g00378872
(A) Drive Pump. (B) Charge Pump.

Drive Pump

Illustration 2	g00377032

Relief Valve settings

Main ... 42000 + 3000 - 0 kPa (6100 + 435 - 0 psi)

Charge ... 2450 ± 50 kPa (355 ± 7 psi)

(1) Tightening torque for eight bolts ... 46 N·m (34 lb ft)

(2) Tightening torque for two bolts ... 275 N·m (200 lb ft)

(3) Apply 1U-8846 Anaerobic Flange Sealant to the housing when the head group is being installed.

(4) Tightening torque for eight bolts ... 46 N·m (34 lb ft)

(5) Apply 4C-9506 Retaining Compound to the housing when the bottom cover is installed.

Tightening torque for the bolt (not shown) on the lower left side of the head group ... 42 N·m (31 lb ft)

Rotation is counterclockwise when the rotation is viewed from the drive end.

Type of pump: Piston

For the test, use SAE 10W oil that is at 65°C (150°F).

Test at Full Speed:

Output flow rate ... 153 L/min (40 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2200 rpm

Engine speed ... 2000 rpm

Output flow rate ... 149 L/min (38 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2200 rpm

Engine speed ... 2000 rpm

Test at Half Speed:

Output flow rate ... 76 L/min (20 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1100 rpm

Engine speed ... 1000 rpm

Output flow rate ... 74 L/min (19 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1100 rpm

Engine speed ... 1000 rpm

Charge Pump

Illustration 3	g00378932

Rotation is counterclockwise when the rotation is viewed from the drive end.

Type of pump: Gear

For the test, use SAE 10W oil that is at 65°C (150°F).

Test at Full Speed:

Output flow rate ... 107 L/min (28 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2200 rpm

Engine speed ... 2000 rpm

Output flow rate ... 106 L/min (27 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2200 rpm

Engine speed ... 2000 rpm

Test at Half Speed:

Output flow rate ... 53 L/min (14 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1100 rpm

Engine speed ... 1000 rpm

Output flow rate ... 52 L/min (13 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1100 rpm

Engine speed ... 1000 rpm