325, 325B and 325L Excavators Caterpillar

Illustration 1	g00703135

Output torque ... 41,994 N·m (31,038 lb ft)

Input speed ... 2600 rpm

Input torque ... 666 N·m (493 lb ft)

Ratio ... 65.91:1

Static brake torque

Standard ... 375 N·m (278 lb ft)

Optional 102-8299 Piston Motor ... 500 N·m (371 lb ft)

Brake release pressure ... 760 kPa (110 psi)

Maximum brake release pressure ... 34,300 kPa (5000 psi)

Maximum operating temperature ... 90 °C (194 °F)

Approximate weight ... 313.77 kg (690.3 lb)

Type of drive motor ... Dual displacement, bent-axis piston

Track motor displacement per revolution

Low speed ... 131 cc (7.99 in³)

High speed ... 86 cc (5.25 in³)

Speeds ... 2

(1) Apply 9S-3263 Thread Lock on the threads of bolts.

(2) Apply 9S-3263 Thread Lock on the threads of bolts (2) .

Torque for 20 bolts (2) ... 530 ± 70 N·m (390 ± 50 lb ft)

(3) Apply 1U-8846 Gasket Maker to the surfaces of gear (3).

(4) After you install the seven pins, make stake marks near the opening of each pin hole. An example is shown in View B.

(5) Apply 9S-3263 Thread Lock on the threads of bolts (5) .

Torque for 16 bolts (5) ... 570 ± 70 N·m (390 ± 50 lb ft)

(6) At assembly, O-rings of the floating seals and all surfaces in contact with the O-rings must be clean and dry. Apply a thin coat of oil on the contacting surfaces of the metal seals before installation.

(7) Use the plate to achieve the correct clearance "A". Clearance "A" equals 1.0 mm (0.04 inch) to 2.0 mm (0.08 inch).

Plate Thickness:

94-0577 Plate ... 7.0 mm (.28 inch)

94-0578 Plate ... 8.0 mm (.31 inch)

94-0579 Plate ... 9.0 mm (.35 inch)

94-0580 Plate ... 10.0 mm (.39 inch)

Grease may be used in the counterbore to retain the spacer at assembly.

(8) Torque for two plugs ... 135 ± 15 N·m (100 ± 11 lb ft)

(9) Apply 5P-3931 Anti-Seize Compound to the surfaces in contact with the pins.

Use the following procedure to adjust the preload of bearing (12) :

1. Place a load "P" of 4000 kg (8820 lb) on bearing (12) .

2. Rotate the housing (13) in order to seat the bearing.

3. Reduce load (P) to 1000 ± 100 kg (2200 ± 220 lb).

4. Measure dimension (C) .

5. Measure dimension (D) of gear (10) .

6. Use a maximum of two shims (11) to achieve the correct clearance.

Note: If two shims (11) are used, place the thinnest shim next to gear (10) .

(11) Thickness of shim

7Y-0746 Shim ... 0.15 mm (.006 inch)

7Y-0747 Shim ... 0.3 mm (.012 inch)

7Y-0748 Shim ... 0.4 mm (.016 inch)

7Y-0749 Shim ... 0.5 mm (.020 inch)

7Y-0750 Shim ... 0.6 mm (.024 inch)

7Y-0751 Shim ... 0.7 mm (.028 inch)

7Y-0752 Shim ... 0.8 mm (.031 inch)

7Y-0753 Shim ... 1.0 mm (.039 inch)

7Y-0754 Shim ... 1.6 mm (.063 inch)

After assembly, apply 98 kPa (14 psi) of air pressure through the fill plug opening and sustain the air pressure for at least 30 seconds. There should not be any air leak for at least 30 seconds.