DESARMADO Y ARDO DE BOMBA HIDRAULICA CATERPILLAR 428B
a. remove counterweight
1. Remove drain plug (1), and drain the oil from the hydraulic tank into a suitable container.
2. Follow the procedures below to loosen bolts (2). a. First, disconnect the fuel shut-off solenoid at the fuel injection pump. b. Crank the engine until bolts (2) are in alignment with the access hole in the engine mounting assembly. Loosen bolts (2) that hold drive shaft and hydraulic pump coupling.
3. Disconnect hydraulic hoses (4) and (5) and lines (3) and (6).
4. Remove mounting nuts (7) to remove hydraulic pump (8). 5. Reverse the procedures in Steps 1 through 4 for the installation of the hydraulic pump. End By: a. install counterweight
Disassemble & Assemble Implement Pump (416B)
1. Remove tube (1). 2. Remove bolts and torque limiter (2). 3. Remove bolts and compensator (3).
4. Remove plug (4). 5. Remove spring (5). 6. Remove seat (6).
7. Remove spool (7). 8. Remove internal spool (8). 9. Remove adjuster cap (12) and adjusting screw (13). NOTE: Do not move adjusting screw to maintain adjustment for later assembly. 10. Remove internal spring (10) and spring (11). 11. Remove dual spring seat (9).
12. Remove cap (21). 13. Remove spool nut (19). NOTE: Do not move adjusting screw to maintain adjustment for later assembly. 14. Remove spacer (18). 15. Remove internal spring (17) and spring (16). 16. Remove spring seat (15). 17. Remove spool (14). 19. Remove cap (27). 20. Remove spool nut (20). NOTE: Do not move adjusting screw to maintain adjustment for later assembly. 21. Remove spacer (26). 22. Remove internal spring (25) and spring (24). 23. Remove spring seat (23). 24. Remove spool (22).
25. Remove four bolts (28). 26. Remove cover (29) from the pump body.
27. Remove piston (30). 28. Remove shoe (31). 29. Remove spring (32).
30. Remove valve plate (33). 31. Remove bearing cup (34).
32. Remove one bolt. 33. Remove torque limit coupling (35). 34. Remove bearing (36).
35. Remove spacer (38). 36. Remove cylinder block (37).
37. Remove nine pistons (39) and plate (40) from cylinder block (37).
38. Remove spherical washer (41) from cylinder block.
39. Remove three pins (42).
40. Use a press and a 4B5273 1/2" Washer (43) to compress the spring, and remove snap ring (44) with Tool (B). 41. Release the tension on the spring.
42. Remove washer (44), spring (45) and washer (43) from cylinder block (37).
43. Remove swashplate assembly (45).
44. Remove two swashplate bearings (46).
45. Remove bearing cup (47).
46. Remove retaining ring (48). 47. Remove seal (49). NOTE: The following steps are for the assembly of the implement pump.
48. Install new seal (49). 49. Install retaining ring (48).
50. Install new bearing cup (47).
51. Inspect and replace swashplate (45) if necessary. 52. Inspect and replace shoes (50) if necessary. 53. Inspect and replace pin (52) if necessary and torque limiter adapter (51).
54. Remove and clean debris from in and behind the two orifices (53). 55. Install the orifices.
56. Install plate (40) and nine pistons (39) into cylinder block (37).
57. Install new bearing on shaft (54).
58. Assemble shaft (54), swashplate (45) and cylinder block (37) on shaft (54).
59. Position the assembly as shown.
60. Apply a small amount of grease to the backside of bearings (46) and install into pump housing.
61. Install pump housing over shaft assembly as shown.
62. Turn the pump over on the side or end. 63. Line up to limit adapter as shown.
64. Install limit adapter (35).
65. Install spacer (38).
66. Install bearing (36).
67. Remove and clean debris out from behind orifice (55). 68. Remove orifice (55).
69. Replace two O-rings (56) and (57).
70. Preassemble the torque limiter as shown. Do not assemble spring (5) or plug (4) at this point.
71. Install new bearing (34). 72. Inspect and install (replace if necessary) valve plate (33).
73. Install four new O-rings (58). 74. Apply a liberal amount of grease on post (59) and shoe (31). 75. Install piston (30) on post (59). 76. Install shoe (31), spring (32) on post (59).
77. Install torque limiter (2) without spring (5) or plug (4). 78. Install new O-ring (60). 79. Install pump head (29) to pump body with pump in position as seen in photo C58933P1 Step 66 in this procedure.
80. Assemble compensator. NOTE: Replace O-rings on spool nuts (19) and (20).
81. Replace three O-rings (61).
82. Install compensator (3). 83. Install tube (1). 84. Install spring (5). 85. Install cap (4).
Disassemble Implement Pump (426B)
Start By: a. remove implement pump (426B)
1. Remove bolts (2) that hold the compensator to the valve block. Remove compensator (1).
2. Remove gasket seals (3) from body of the compensator.
3. Remove adjustment nut (4) and the plug. Remove plug (5).
4. Remove seat (7), spring (6) and spacer (8). Remove valve spool (9).
5. Remove adjustment screw (10) and plug (11).
6. Remove seat (12), spring (13) and spacer (14). Remove valve spool (15).
7. Remove bolts (17), and remove valve block (16) and the gasket.
8. Remove stem (18), stem (19), pin (20) and remove valve assembly (21) from the valve block.
9. Remove spring (23), water plate (22) and cylinder-bias (24).
10. Remove bearing assembly (25).
11. Remove cylinder block (26).
12. Carefully compress the spring, and remove the retaining ring with Tool (A).
13. Remove the spring washer, spring (27) and the spring washer from the cylinder block.
14. Remove bolts (28) and cover (29).
15. Remove key lock (30).
16. Remove piston and shoe assembly (31) from the pump body.
17. Remove O-ring seal (32), bearing spacer (33) and bearing (34).
18. Remove shaft (35), swashplate (36) and the yoke and bumper assembly from the pump housing.
19. Remove bearing assembly (37).
20. Remove bearing race (38) and inner lip seal (39).
21. Remove outer lip seal (40).
Assemble Implement Pump (426B)
1. Install the inner and outer seals in the pump housing with Tool (A).
2. Lower the temperature of the bearing race, and install it in the pump housing. 3. Install bearing assembly (1). 4. Install the yoke and bumper assembly in the pump housing.
5. Follow the procedures below to provide the proper preload on the bearings. 6. Lower the temperature of the bearing race, and install it in the pump housing. Install bearing (2) and bearing spacer (3). Do not install the O-ring at this time.
7. Install cover (4), and tighten bolts (5) to a torque of 15 to 17 N·m (11 to 13 lb ft)
8. Turn the pump housing over. Lower the temperature of the bearing race, and install it in the pump housing. Install bearing (7) and bearing spacer (6). Do not install the O-ring at this time.
9. Rotate the yoke assembly back and forth to seat the bearings. 10. Measure the distance between the spacer and housing with a depth micrometer as shown.
11. Install the proper shim (8) to have a 0.25 to 0.40 mm (0.010 to 0.016 in) axial preload. Install bearing spacer (6), O-ring seal, cover and bolts. Tighten the bolts to a torque of 15 to 17 N·m (11 to 13 lb ft). 12. Turn the housing over again, and remove the other cover and bolts. Install the Oring seal, cover and bolts. Tighten the bolts to a torque of 15 to 17 N·m (11 to 13 lb ft). NOTE: The yoke will be stiff but should be loose enough to be moved by hand. If the yoke can not be moved by hand, the preload is too great. Repeat the preload adjustment until it is correct.
NOTICE Put tape around the splines on shaft (9) to avoid damaging the shaft
seal when the shaft is installed. 13. Put shaft (9) in position in the housing.
14. Install swashplate (10) making sure the hole in the swashplate is in alignment with pin (11).
15. Install spring washer (14), spring (12) and spring washer (15) in the cylinder block. Install retaining ring (13) on top of spring washer (15).
16. Put the cylinder block assembly in a press. 17. Carefully compress the spring, and install the retainer ring with Tool (B).
18. Install piston and shoe assembly (16) in the cylinder block.
19. Install the piston and cylinder block assembly in the pump housing.
20. Turn the cage shoe assembly so that key slot (17) will be in alignment when the key is installed.
21. Remove the bolts and covers, and install key (18). 22. Install cover and bolts. Tighten the bolts to a torque of 15 to 17 N·m (11 to 13 lb ft).
23. Install spacers (20) and bearing (19).
24. If the shaft bearing, shaft, valve block or housing was replaces, a bearing adjustment is necessary. Use the following procedures. 25. Lower the temperature of the bearing race, and install it in the valve block with Tool (A). 26. Install pin (21) and check valve (22).
27. Install the valve block on the housing, and hand tighten the bolts evenly. Measure the gap at four positions around the housing, and take the average reading. Also measure the gasket thickness. With this measurement, determine the spacer or spacers necessary to obtain 0.00 to 0.100 mm (0.00 to 0.0039 in) bearing end play. Remove the valve block, and install the correct spacer or spacers.
28. Install stems (23) and (24) in the valve block. Tighten the stems to a torque of 75 to 85 N·m (55 to 65 lb ft).
29. Install washer plate (25) on the valve block, making sure the slot in the plate is in alignment with the pin in the valve block. Put clean grease on the plate to hold it in place.
30. Install spring (28) and cylinder (27) on stem (24). Install cylinder (26) on stem (23). 31. Put clean grease on the cylinders to hold them in place for assembly.
32. Put valve block (29) in position, and install bolts (30) that hold it. Tighten the bolts to a torque of 50 to 55 N·m (37 to 41 lb ft).
33. Install valve spool (33) and plug (35). Install spacer (32), spring (34) and seat (31).
34. Install adjustment nut (37).
35. Install valve spool (42) and plug (36). 36. Install spacer (41), spring (40), seat (39) and adjustment plug (38).
37. Install gasket seals (43) on the compensator body.
38. Put compensator (44) in position on the valve block, and install bolts (45) that hold it. Tighten the bolts to a torque of 31 to 37 N·m (23 to 27 lb ft) End By: a. install implement pump (426B)
PIEZAS INDIVIDUALES
1
NPR
6E-3343
Cant. Nombre de la pieza req. 1 RING
2 3
NPR NPR
6E-4004 103-5517
1 1
SEAL-SHAFT HOUSING-PUMP
4 5
NPR NPR
3E-6770 6E-6174
1 1
SEAL-O-RING PLUNGER
6 7
NPR NPR
8J-0412 3P-1210
1 1
CUP-BEARING CONE-BEARING
8 9
NPR NPR
6E-6176 6E-6175
1 1
SPRING CYLINDER
10 11
NPR NPR
3E-6769 6E-6164
4 1
12
NPRM
095-9805
4
13 14
NPR NPR
083-4419 6E-3999
1 1
SEAL-O-RING HEAD BOLT-SOCKET HEAD (M14X2X40-MM) PIN SPACER (49X57X3-MM THK)
15 16
NPR NPR
1P-6872 8C-7110
1 1
CUP-BEARING CONE-BEARING
Ref. Cant. NPRNota No. de pieza
17
NPR
6E-4000
1
18
NPR
6E-6173
1
SPACER (25.5X35X3-MM THK) GUIDE
19 20
NPR NPR
6E-6172 9T-3940
1 1
PISTON PLUG-BREAK OFF
21 22
NPR NPR
120-5721 6E-4003
1 2
SWASHPLATE AS BEARING
23 24
NPR NPR
101-0508 6E-6163
2 1
PLUG-ORIFICE SHAFT
25 26
NPR NPR
9S-8006 2M-9780
1 1
PLUG-O RING SEAL-O-RING
27 28
NPRM NPR
6V-5683 3C-8388
1 1
BOLT (M6X1X16-MM) PIN-ROLL
29 30
NPR NPR
103-5520 103-5521
1 1
CARRIER-PIN KIT-TUBE
31
NPR NPR
103-5522 3J-7354
1 1
ADAPTER AS SEAL-O-RING
NPRYF
6E-6160
1
NPRYF
103-5519
1
NPRYF
6E-6170
1
ROTATING GP-PUMP VALVE GP-PUMP CONTROL (POWER COMPENSATOR) VALVE GP-PUMP CONTROL (PRESSURE, FLOW COMPENSATOR)
PIEZAS INDIVIDUALES
Ref. Cant. NPRNota
No. de pieza
1
NPR
6E-6151
Cant. Nombre de la pieza req. 9 PISTON AS
2 3
NPR NPR
6E-6154 6E-6155
1 1
PLATE-RETRACTION BEARING
4 5
NPR NPR
6E-6152 6E-6159
1 2
BARREL SPACER
6 7
NPR NPR
6E-6156 6E-6158
1 1
SPRING RING
8 9
NPR NPR
6E-6153 6E-6157
1 3
PLATE-PORT PIN
PIEZAS INDIVIDUALES
Ref. Cant. NPRNota
No. de pieza
1
NPR
6E-6527
Cant. Nombre de la pieza req. 2 PLUG
2 4
NPR NPR
6E-6528 9X-7680
6 3
SEAL SEAL-O-RING
5 6
NPRC NPRC
5P-9262 105-2145
1 1
SEAL-O-RING VALVE-ORIFICE
8 9
NPR NPR
6E-3269 6E-3276
1 1
RETAINER-SPRING SPRING
10 11
NPR NPR
6E-3273 033-6034
1 1
SEAT SEAL-O-RING
12
NPR
6E-6536
1
13
NPRM
6E-6537
2
14
NPRM
6E-6538
2
15
NPRM
6E-6539
2
PLUG SCREW-ADJUSTMENT (M8X1X28-MM) NUT-ADJUSTMENT (M8X1THD) NUT-CAP (M8X1-THD)
16 17
NPR NPR
6E-6540 033-6043
1 1
PLUG SEAL-O-RING
18
NPR
6E-3272
1
SEAT
19 20
NPR NPR
6E-3274 6E-3275
1 1
SPRING SPRING
21 22
NPR NPR
6E-3268 9S-8002
1 1
RETAINER-SPRING PLUG-O-RING
23
NPR
3J-7354
1
24
NPRM
096-3218
1
25
NPRM
8T-8442
4
SEAL-O-RING SETSCREW-SOCKET (M4X0.4X6-MM) BOLT-SOCKET HEAD (M6X1X30-MM)
PIEZAS INDIVIDUALES
Ref. Cant. NPRNota
No. de pieza
1 2
NPR NPR
105-1434 5P-5599
Cant. Nombre de la pieza req. 1 PLUG 1 SEAL-O-RING
3 4
NPR NPR
105-1435 105-1436
1 1
SPRING RETAINER-SPRING
5 6
NPR NPR
214-0592 6V-8236
1 1
GASKET PIN-SPRING
7
NPR
6E-6528
1
SEAL
8
NPRM
3T-0849
2
9
NPR
105-1437
1
BOLT-SOCKET HEAD (M6X1X25-MM) RETAINER-SPRING
10 11
NPR NPR
105-1438 033-6044
1 1
SPRING SEAL-O-RING
12 13
NPR NPR
105-1439 105-1440
1 1
ADJUSTER CAP
14
NPR
105-1441
1
PLUG
