CX28 On-Highway Transmission Caterpillar

Planetary Group

Illustration 1	g03093497

Illustration 2	g03094698
View A (Without Power Take-Off Configuration) View B (Side Power Take-Off) View (A) and view (B) contain the same parts that are called out in Illustrations 1 and 2. (1) Crescent Pump for planetary transmissions without power take-Off configuration (2) Crescent Pump for side and rear power take-off.

Illustration 3	g02799183
View C (Rear Power Take-Off) (D) View of area (2) Crescent Pump (3) 293-9088 Clutch GP (3 and 4) (4) 293-3622 Planetary Carrier Gp (5) 257-7589 Clutch plate (6) 257-7588 Friction Disc (7) 260-3460 Wave Spring (8) 256-6354 Planetary Carrier Gp (9) 257-8656 Thrust Bearing (10) 260-3454 Main Shaft (11) 345-8092 Transmission Cover Gp (12) 293-9143 Clutch GP (1 and 2) (13) 257-8660 Thrust Bearing (14) 288-3864 Shim Pack

(9) 257-8656 Thrust Bearing

Thickness of bearing under load of 2000 N (450 lb) ... 3.85 mm (0.152 inch)

Inner diameter ... 33.78 ± 0.2 mm (1.33 ± 0.008 inch)

Outer diameter ... 51.925 ± 0.125 mm (2.044 ± 0.005 inch)

Illustration 4	g02799185

(10) 260-3454 Main Shaft

Sun gear shaft journal (E) ... 19.97 ± 0.01 mm (0.786 ± 0.004 inch)

Sun gear shaft journal (F) ... 19.97 ± 0.01 mm (0.786 ± 0.004 inch)

Sun gear shaft journal (G) ... 41.953 ± 0.012 mm (1.6517 ± 0.0005 inch)

Clutch 1 and 2

Illustration 5	g01520405

(12) 293-9143 Clutch GP (1 and 2)

(19) 256-6349 Bushing

Thickness of bushing ... 15 ± 0.25 mm (0.59 ± 0.01 inch)

Inner diameter ... 20 mm (0.79 inch)

Outer diameter ... 23 mm (0.91 inch)

Inner diameter after installation ... 20.03 ± 0.04 mm (0.789 ± 0.002 inch)

(22) 257-8630 Bushing

Thickness of bushing ... 15 ± 0.25 mm (0.59 ± 0.01 inch)

Inner diameter ... 100 mm (3.94 inch)

Outer diameter ... 105 mm (4.13 inch)

Inner diameter after installation ... 100.068 ± 0.067 mm (3.940 ± 0.003 inch)

Clutch 1

(15) 257-8623 Wave Spring

Force at 30.2 mm (1.19 inch) ... 6000 ± 500 N (1349 ± 112 lb)

Force at 38 mm (1.5 inch) ... 3914.42 N (880 lb)

Free length after test ... 66.2 mm (2.61 inch)

Number of coils ... 3.5

Outside diameter ... 157.36 ± 0.7 mm (6.2 ± 0.03 inch)

(16) 257-6106 Clutch plate

Thickness of plate ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

(18) 257-6102 Friction Disc

Thickness of friction disc ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

Clutch 2

(17) 257-6105 Friction Disc

Thickness of friction disc ... 3.2 ± 0.08 mm (0.126 ± 0.003 inch)

(20) 257-6108 Clutch plate

Thickness of plate ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

(21) 257-8624 Wave Spring

Force at 23 mm (0.91 inch) ... 5270 ± 1054 N (1185 ± 237 lb)

Force at 28 mm (1.1 inch) ... 2750 ± 275 N (618 ± 62 lb)

Free length after test ... 33.5 mm (1.32 inch)

Number of waves ... 6.5

Outside diameter ... 200.89 ± 0.8 mm (7.91 ± 0.032 inch)

Clutch 3 and 4

Illustration 6	g01520216

(3) 293-9088 Clutch GP (3 and 4)

(23) 257-8639 Return Spring Assembly

(23a) 271-3426 Spring

Length under test force ... 21 mm (0.83 inch)

Test force ... 47 ± 2.9 N (10.57 ± 0.65 lb)

Free length after test ... 31.3 mm (1.23 inch)

Number of coils ... 9.1

Outside diameter ... 11.1 ± 0.15 mm (0.437 ± 0.006 inch)

(23b) 258-6290 Spring

Length under test force ... 21 mm (0.83 inch)

Test force ... 65 ± 4.4 N (14.6 ± 1 lb)

Free length after test ... 30.1 mm (1.19 inch)

Number of coils ... 7

Outside diameter ... 15.5 ± 0.15 mm (0.61 ± 0.006 inch)

(24) 260-3493 Cushion Spring

Thickness of spring ... 11.5 ± 0.5 mm (0.45 ± 0.02 inch)

Number of waves ... 9

Force at 10 mm (0.4 inch) ... 4486 ± 673 N (1008.5 ± 151.3 lb)

(25) 257-8633 Friction Disc

Thickness of friction disc ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

(26) 257-8634 Clutch plate

Thickness of plate ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

Clutch 5

(5) 257-7589 Clutch plate

Thickness of plate ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

(6) 257-7588 Friction Disc

Thickness of friction disc ... 2.5 ± 0.08 mm (0.098 ± 0.003 inch)

(7) 260-3460 Wave Spring

Force at 16 mm (0.63 inch) ... 4909 ± 982 N (1103.6 ± 220.8 lb)

Force at 25 mm (0.98 inch) ... 970 ± 97 N (218.1 ± 21.8 lb)

Free length after test ... 27.2 mm (1.07 inch)

Number of waves ... 7.5

Outside diameter ... 289.05 ± 0.9 mm (11.38 ± 0.04 inch)

Crescent Pump (Without Power Take-Off Configuration)

Illustration 7	g01520996

(1) 313-1528 Crescent Pump

(H) Rotor bushing ... 85.030 mm to 85.165 (3.348 to 3.353 inch)

(J) Impeller bushing ... 64.984 to 65.116 mm (2.558 to 2.564 inch)

Crescent Pump (Power Take-Off)

Illustration 8	g01520997

(2) 313-1527 Crescent Pump

(K) Impeller bushing ... 64.984 to 65.106 mm (2.558 to 2.563 inch)

Pump clearance ... 0.05 ± 0.02 mm (0.002 ± 0.0008 inch)

Assembled rolling torque ... 0.9 N·m (8 lb in)

Cold Start Valve

Illustration 9	g01523148
View A-A (2a) Cold start valve (2c) Ball

(2b) Spring

(Length under test force) ... 35.3 mm (1.4 inch)

Test force ... 318 ± 14 N (71.5 ± 3.15 lb)

Free length after test ... 55.97 ± 1.15 mm (2.2 ± 0.05 inch)

Planetary Carrier 1

Illustration 10	g01520343

(4) 293-3622 Planetary Carrier Gp

(27) 293-4230 Planetary Shaft Assembly

Diameter of shaft ... 21.996 ± 0.006 mm (0.866 ± 0.0002 inch)

(28) 290-1466 Bushing

Thickness of bushing ... 14.5 ± 0.25 mm (0.57 ± 0.01 inch)

Inner diameter before installation ... 68 mm (2.68 inch)

Inner diameter after installation ... 68.05 ± 0.06 mm (2.679 ± 0.002 inch)

Outer diameter ... 73 mm (2.87 inch)

Planetary Carrier 2

Illustration 11	g01520524

(8) 256-6354 Planetary Carrier Gp

(29) 257-5564 Bushing

Width of bushing ... 27 ± 0.25 mm (1.063 ± 0.01 inch)

Size of lube holes ... 4.25 ± 0.25 mm (0.17 ± 0.01 inch)

Inner diameter ... 42 mm (1.65 inch)

Outer diameter ... 47 mm (1.85 inch)

Inside diameter after assembly ... 41.990 to 42.105 mm (1.653 to 1.658 inch)

(30) 280-2618 Planetary Shaft Assembly

Diameter of shaft ... 21.996 ± 0.006 mm (0.866 ± 0.0002 inch)

(L) 256-6352 Planetary Carrier

Shaft journal ... 67.945 ± 0.015 mm (2.675 ± 0.0006 inch)

Planetary Cover (Rear)

Illustration 12	g01520505

(11) 345-8092 Transmission Cover Gp

(31) 280-2620 Planetary Shaft Assembly

Diameter of shaft ... 31.745 ± 0.006 mm (1.2498 ± 0.0002 inch)

(32) 256-6349 Bushing

Width of bushing ... 15 ± 0.25 mm (0.59 ± 0.01 inch)

Inner diameter ... 20 mm (0.79 inch)

Outer diameter ... 23 mm (0.91 inch)

Shimming Procedure

Illustration 13	g03094780
View of Area D

(13) 257-8660 Thrust Bearing

Thickness of bearing under a load of 2000 N (450 lb) ... 5.277 ± 0.075 mm (0.208 ± 0.003 inch)

Inner diameter ... 102.49 ± 0.15 mm (4.035 ± 0.006 inch)

Outer diameter ... 132.11 mm (5.201 inch)

(33) 310-1107 Support Plate

Shimming Procedure

(14) 288-3864 Shim Pack

Quantity of each shim ... 1

Thickness of shim ... 0.3 mm (0.012 inch)

Thickness of shim ... 0.5 mm (0.020 inch)

Thickness of shim ... 0.8 mm (0.032 inch)

Thickness of shim ... 1.1 mm (0.043 inch)

Thickness of shim ... 1.4 mm (0.055 inch)

Thickness of shim ... 1.6 mm (0.063 inch)

Thickness of shim ... 1.9 mm (0.075 inch)

Dimension (R) is equal to dimension (N) plus dimension (P) minus dimension (M) minus dimension (S) minus dimension (T) .

(M) The measured value on the assembly without the dimension of the gasket.

(N) Measured value on 310-1107 Support Plate

(P) Thickness of gasket ... 0.762 mm (0.032 inch)

(R) Shim width that will be attained.

(S) Thickness of bearing ... 5.277 ± 0.075 mm (0.208 ± 0.003 inch)

Note: The tolerance of + 0 to − 0.3 mm (+ 0 to − 0.012 inch) will be applied to the shim thickness.

(T) Air gap ... 0.125 mm (0.005 inch)