CB44B Vibratory Asphalt Compactor Propel System Caterpillar

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Diesel engine exhaust contains products of combustion which may cause personal injury. Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside.

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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts. Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified. The machine must be parked on a level surface and the engine stopped. Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine.

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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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Injury to personnel can result if they are not in the operator's view. Allow only essential personnel near the machine, and make sure the personnel are in the operator's view when testing, to prevent injury. Make sure checks are done in an open area.

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Hot parts or hot components can cause burns or personal injury. Do not allow hot parts or components to contact your skin. Use protective clothing or protective equipment to protect your skin.

Note: In order to perform this test and adjust, the brakes must be disconnected or the machine must be placed on jack stands.

1. Drive the machine to a smooth, horizontal surface.
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   Illustration 1	g03191077

2. Move propel lever (1) to the NEUTRAL position.

3. Move parking brake switch (2) to the ON position.

4. Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.

   Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.

5. Move engine start switch (4) to the OFF position.
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   Illustration 2	g03191078

6. Unlock latch (5) and open engine compartment door (6) on the right side of the machine.
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   Illustration 3	g03191079

7. Remove ten bolts (7) and remove side panel (8) on the right side of the machine.
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   Illustration 4	g03191080

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   Illustration 5	g03191081

8. Disconnect brake hose assemblies (9) at the four motors. Use Tool (E) to cap the port. Use Tool (F) to plug the hose.
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   Illustration 6	g03191137

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   Illustration 7	g03191138

9. Mark the electrical connections. Disconnect electrical solenoid connections (10).
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   Illustration 8	g03191139

10. Remove the plug from port "M5" (11). Install Tool (H) in port "M5" (11). Tighten Tool (H) to a torque of 12 N·m (9 lb·ft).

11. Assemble Tool (J). Connect one end of Tool (J) to Tool (H) in port "M5" (11).
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    Illustration 9	g03191140

12. Install other Tool (H) in port "M4" (12).Tighten Tool (H) to a torque of 12 N·m (9 lb·ft). Connect other end of Tool (J) to Tool (H) in port "M4" (12).

13. Assemble the tooling. Connect Tool (C) to Tool (B). Make two sets of tooling.
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    Illustration 10	g03191142

14. Connect one Tool (C) to port "Mb" (13) on the front propel pump. Connect Tool (A) to Tool (B).
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    Illustration 11	g03191144

15. Connect other Tool (C) to port "Ma" (14) on the bottom of the pump. Connect Tool (A) to Tool (B).
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    Illustration 12	g03191145

16. Connect Tool (N) and Tool (M) to Tool (L). Connect Tool (M) to diagnostic connector (15). Connect Tool (N) to USB port on Tool (K).

17. Move engine start switch (4) to the START position. Release the switch when the engine starts.

18. Operate the engine at low idle for a few minutes. Use throttle control switch (3) in order to operate the engine in high idle.

    Note: Two things indicate when the engine is at high idle. First, "High Idle" will appear on the display. Second, all three LED's next to throttle control switch (3) will be illuminated.

19. Monitor the hydraulic oil temperature with Tool (G). Operate the machine until the oil temperature reaches 43 ± 5.6 °C (110 ± 10 °F).

20. Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.

    Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.

21. Move parking brake switch (2) to the OFF position.

    Note: First time users need to perform the tasks in the Communication and Connections Wizard. This wizard allows the Windows® operating system to recognize the USB device. Follow the on screen instructions.

22. Launch the Plus+1^tm program on the computer.
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    Illustration 13	g03191146

23. Click on "Status" button (16).

24. Check "Active Codes" (17). Clear any open "Active Codes".
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    Illustration 14	g03191147

25. Click on "Hydraulics" icon (18).
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    Illustration 15	g03191151

26. Click on "Piston Pump Neutral Test" (19).
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    Illustration 16	g03191154

27. Click on "Enable" icon (20).
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    Illustration 17	g03191156

28. When "Piston Pump Neutral Test" (19) is in "Enabled" mode (21), the Plus+1^TM program is launched.

29. Record the differential pressure between "Ma" and "Mb" on Tool (A). The differential pressure should be less than 150 kPa (22 psi). If the pressure differential is less than 150 kPa (22 psi), go to Step 56. If the differential pressure is not within 150 kPa (22 psi), go to Step 30.

30. Move parking brake switch (2) to the ON position.

31. Move engine start switch (4) to the OFF position.

32. Disconnect Tool (J) from Tool (H) in port "M5" (11). Disconnect other end of Tool (J) from Tool (H) in port "M4" (12).

33. Assemble the tooling. Connect one Tool (B) to each Tool (D). Connect Tool (A) to Tool (B).
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    Illustration 18	g03191158

34. Connect one Tool (D) to Tool (H) in port "M5" (11).
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    Illustration 19	g03214218

35. Connect one Tool (D) to Tool (H) in port "M4" (12).
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    Illustration 20	g03214219

36. Remove lock-screws (22) and lock-plate (23) from " M5" servo cylinder cap (24) on the section of the propel pump closest to the engine.
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    Illustration 21	g03214220

37. Remove lock-screws (26) and lock-plate (27) from "M4" servo cylinder cap (25) on the section of the propel pump closest to the engine.

38. Using a 3/4" deep socket, unthread servo cylinder cap (24) and servo cylinder cap (25) two to three turns. This action will ensure that the servo cylinder caps are not in contact with the servo piston.

39. Move engine start switch (4) to the START position. Release the switch when the engine starts.

40. Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.

    Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.

41. Move parking brake switch (2) to the OFF position.

42. Repeat Step 22 through Step 28 in order to launch the Plus+1^TM program on the computer.
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    Illustration 22	g03214221

43. Loosen locknut (28) and rotate adjustment screw (29). Note the pressure at port "M4" and port "M5". Rotate adjustment screw (29) until the servo pressure at port "M4" is 95 - 200 kPa (14 - 29 psi) greater than port "M5".

44. The system pressure at port "Ma" and port "Mb" should indicate displacement. Clockwise rotation of adjustment screw (29) will increase pressure at port "Ma". Counter clockwise rotation of adjustment screw (29) will increase pressure at port "Mb". This action indicates the servo piston is in contact with the servo cylinder cap on the "M5" side of the pump.

45. Slowly turn cylinder cap (24), on the "M5" side of the pump, in until the system pressure differential starts to decrease. Maintain "M4" servo pressure 95 - 200 kPa (14 - 29 psi) higher than "M5" servo pressure during this step.

46. Continue turning cylinder cap (24), on the "M5" side of the pump, in until the system pressure differential between port "Ma" and port "Mb" is less than 150 kPa (22 psi). This action will set the servo and swashplate to mechanical neutral on the "M5" side.

47. Replace lock-screws (22) and lock-plate (23) on " M5" servo cylinder cap (24). Tighten lock-screws (22) to a torque of 14.5 N·m (11 lb·ft).

48. Rotate adjustment screw (29). Note the pressure at port "M4" and port "M5". Rotate adjustment screw (29) until the servo pressure at port "M5" is 95 - 200 kPa (14 - 29 psi) greater than port "M4".

49. The system pressure at port "Ma" and port "Mb" should indicate displacement. Clockwise rotation of adjustment screw (29) will increase pressure at port "Ma". Counter clockwise rotation of adjustment screw (29) will increase pressure at port "Mb". This action indicates the servo piston is in contact with the servo cylinder cap on the "M4" side of the pump.

50. Slowly turn cylinder cap (25), on the "M4" side of the pump, in until the system pressure differential starts to decrease. Maintain "M5" servo pressure 95 - 200 kPa (14 - 29 psi) higher than "M4" servo pressure during this step.

51. Continue turning cylinder cap (25), on the "M4" side of the pump, in until the system pressure differential between port "Ma" and port "Mb" is less than 150 kPa (22 psi). This action will set the servo and swashplate to mechanical neutral on the "M4" side.

52. Replace lock-screws (26) and lock-plate (27) on "M4" servo cylinder cap (25). Tighten lock-screws (27) to a torque of 14.5 N·m (11 lb·ft).

53. The mechanical neutral is now set on the section of the propel pump closest to the engine.

54. Turn adjustment screw (29) until pressures at "M4" and "M5" are equal.

55. Hold adjustment screw (29) in place and tighten locknut (28). Tighten locknut (28) to a torque of 10 N·m (7 lb·ft).

56. Move parking brake switch (2) to the ON position.

57. Move engine start switch (4) to the OFF position.

58. Remove tooling from port "M4" and port "M5". Replace the plugs. Tighten the plugs to a torque of 12 N·m (9 lb·ft).
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    Illustration 23	g03214258

59. Remove the plug from port "M4" (30) on the section of the propel pump away from the engine. Install Tool (H) in port "M4" (30). Tighten Tool (H) to a torque of 12 N·m (9 lb·ft).
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    Illustration 24	g03214276

60. Remove the plug from port "M5" (31) on the section of the propel pump away from the engine. Install other Tool (H) in port "M5" (31). Tighten Tool (H) to a torque of 12 N·m (9 lb·ft).

61. Connect one end of Tool (J) to Tool (H) in port "M4" (30). Connect other end of Tool (J) to Tool (H) in port "M5" (31).

62. Remove tooling from port "Ma" and port "Mb".
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    Illustration 25	g03214296

63. Connect one Tool (C) to port "Mc" (32) on the section of the propel pump away from the engine. Connect Tool (B) to Tool (C). Connect Tool (A) to Tool (B).
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    Illustration 26	g03214337

64. Connect other Tool (C) to port "Md" (33) on the bottom of the propel pump section away from the engine. Connect Tool (B) to Tool (C). Connect Tool (A) to Tool (B).

65. Move engine start switch (4) to the START position. Release the switch when the engine starts.

66. Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.

    Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.

67. Move parking brake switch (2) to the OFF position.

68. Repeat Step 22 through Step 28 in order to launch the Plus+1^TM program on the computer.

69. Read the differential pressure between "Mc" and "Md" on Tool (A). The differential pressure should be less than 150 kPa (22 psi). If the pressure differential is less than 150 kPa (22 psi), go to Step 94. If the differential pressure is not within 150 kPa (22 psi), go to Step 70.

70. Move parking brake switch (2) to the ON position.

71. Move engine start switch (4) to the OFF position.

72. Disconnect Tool (J) from Tool (H) in port "M5" (31). Disconnect other end of Tool (J) from Tool (H) in port "M4" (30).

73. Connect one Tool (D) to Tool (H) in port "M4" (30). Connect Tool (A) to Tool (B).

74. Connect one Tool (D) to Tool (H) in port "M5" (31). Connect Tool (A) to Tool (B).
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    Illustration 27	g03214338

75. Remove lock-screws (36) and lock-plate (35) from "M4" servo cylinder cap (34) on the rear section of the propel pump.
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    Illustration 28	g03214340

76. Remove lock-screws (39) and lock-plate (37) from "M5" servo cylinder cap (38) on the rear section of the propel pump.

77. Using a 3/4" deep socket, unthread servo cylinder cap (34) and servo cylinder cap (38) two to three turns. This action will ensure that the servo cylinder caps have no contact with the servo piston.

78. Move engine start switch (4) to the START position. Release the switch when the engine starts.

79. Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.

    Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.

80. Move parking brake switch (2) to the OFF position.

81. Repeat Step 22 through Step 28 in order to launch the Plus+1^TM program on the computer.
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    Illustration 29	g03214342

82. Loosen locknut (40) and rotate adjustment screw (41). Note the pressure at port "M4" and port "M5". Rotate adjustment screw (35) until the servo pressure at port "M4" is 95 - 200 kPa (14 - 29 psi) greater than port "M5".

83. The system pressure at port "Mc" and port "Md" should indicate displacement. Clockwise rotation of adjustment screw (41) will increase pressure at port "Md". Counter clockwise rotation of adjustment screw (41) will increase pressure at port "Mc". This action indicates the servo piston is in contact with the servo cylinder cap on the "M5" side of the pump.

84. Slowly turn cylinder cap (38), on the "M5" side of the pump, in until the system pressure differential starts to decrease. Maintain "M4" servo pressure 95 - 200 kPa (14 - 29 psi) higher than "M5" servo pressure during this step.

85. Continue turning cylinder cap (38), on the "M5" side of the pump, in until the system pressure differential between port "Md" and port "Mc" is less than 150 kPa (22 psi). This action will set the servo and swashplate to mechanical neutral on the "M5" side.

86. Replace lock-screws (39) and lock-plate (37) on "M5" servo cylinder cap (38). Tighten lock-screws (39) to a torque of 14.5 N·m (11 lb·ft).

87. Rotate adjustment screw (41). Note the pressure at port "M4" and port "M5". Rotate adjustment screw (41) until the servo pressure at port "M5" is 95 - 200 kPa (14 - 29 psi) greater than port "M4".

88. The system pressure at port "Mc" and port "Md" should indicate displacement. Clockwise rotation of adjustment screw (41) will increase pressure at port "Md". Counter clockwise rotation of adjustment screw (41) will increase pressure at port "Mc". This action indicates the servo piston is in contact with the servo cylinder cap on the "M4" side of the pump.

89. Slowly turn cylinder cap (34), on the "M4" side of the pump, in until the system pressure differential starts to decrease. Maintain "M5" servo pressure 95 - 200 kPa (14 - 29 psi) higher than "M4" servo pressure during this step.

90. Continue turning cylinder cap (34), on the "M4" side of the pump, in until the system pressure differential between port "Md" and port "Mc" is less than 150 kPa (22 psi). This action will set the servo and swashplate to mechanical neutral on the "M4" side.

91. Replace lock-screws (36) and lock-plate (35) on "M4" servo cylinder cap (34). Tighten lock-screws (36) to a torque of 14.5 N·m (11 lb·ft).

92. Turn adjustment screw (41) until pressures at "M4" and "M5" are equal.

93. Hold adjustment screw (41) in place and tighten locknut (40). Tighten locknut (40) to a torque of 10 N·m (7 lb·ft).

94. Move parking brake switch (2) to the ON position.

95. Move engine start switch (4) to the OFF position.

96. Remove tooling from port "M4" and port "M5". Replace the plugs. Tighten the plugs to a torque of 12 N·m (9 lb·ft).

97. Remove tooling from port "Mc" and port "Md".

98. Connect electrical solenoid connections (10).

99. Remove Tool (F) from brake supply hose assembly (9) at the drum propel motors. Remove Tool (E) from the brake inlet port at the drum propel motors. Connect brake supply hose (9) to the brake inlet ports on the propel motors.

100. Remove tooling from diagnostic connector (14).

101. Position side panel (8) and install ten bolts (7).

102. Close engine compartment door (6) on the right side of machine and secure latch (5).