HYDROSTATIC PUMP
COMPONENT REPAIR MANUAL
. 6570269 (3–86)
© Melroe Company 1997 Printed in U.S.A.
INTRODUCTION Melroe recommends that all service technicians attend either field or factory Bobcat Service Workshops for necessary information and education. Workshops are held many times a year at various locations throughout the U.S. and Canada. Contact your District Service Manager or Melroe Service Office Gwinner, N.D. (701) 678–6165 for schedule. This Component Repair Manual provides the Service Technician with information for servicing Hydrostatic Pumps. Make reference to the SERVICE MANUAL for your MODEL Loader to troubleshoot, test, remove and installation of the hydrostatic pumps. See the INDEX Page to find your MODEL Loader, S/N listing, Tab # and Manufacturer.
SAFETY INSTRUCTIONS We Care About Your Safety. Wear safety glasses to prevent eye injury when any of the following conditions exist: • When fluids are under pressure. • Flying debris or loose material is present. • Engine is running. • Tools are being used. W–2019–1285
BEFORE YOU WORK ON THE HYDROSTATIC PUMP Read the complete sequence so you know the complete disassembly or assembly procedure before the work is actually started.
Warnings on the machine and in the manuals are for your safety. Failure to obey warnings can cause injury or death.
This notice identifies procedures which must be followed to avoid damage to the machine. I–2019–0284
W–2044–1285
–5
Hydrostatic Pump Component Repair Manual
INDEX HYDROSTATIC PUMP MANUAL INDEX MODELS
S/N
TAB
SECTION
MANUFACTURER
farmboy, 440, 440B, 443
All
1
A
Cessna
530, 533
All
2
A
Vickers
540, 543
11999 & Below
2
A
Vickers
540, 543
12001 & Above
1
A
Cessna
630, 631, 632
All
2
B
Vickers
641, 642, 642B, 643
All
2
B
Vickers
720, 721, 722
All
2
A
Vickers
730, 731, 732
All
2
B
Vickers
741, 742, 743
All
2
B
Vickers
750 Series
All
3
D
Sundstrad
* 825, T135 & T136
All
1
B
Cessna
843
All
1
C
Cessna
853
All
3
E
Sundstrand
943
All
3
A
Sundstrand
974, 975
ALL
3
B
Sundstrand
1213
All
1
C
Cessna
1600
11999 & Below
2
B
Vickers
1600
12001 & Above
3
C
Sundstrand
2000
All
2
B
Vickers
2400
All
3
C
Sundstrand
Glossary of Terms
TAB #4
* T116 Only: Refer to the Hydraulic Pump Manual, TAB 1, Section F for repair procedure.
Revised June 96
–3
Hydrostatic Pump Component Repair Manual
CESSNA PUMP Section A PARTS IDENTIFICATION MODEL: farmboy, 440, 443 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1 MODEL: 540, 543 (S/N 12001 & Above) . . . . . . . . . . . . . . . . . . . . . . . . . . A–2 HYDROSTATIC PUMP Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–3 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–8
TAB 1
–5
Hydrostatic Pump Component Repair Manual
PARTS IDENTIFICATION
Drive End 17 9 10
11 12
14
16
9 10
15
13
1
4 23
11 13 12
15
17
36
13
20 8
18 24
25
13
34 35
7 54 56
16
21 9
1
12 19
26
54 6 45 2 3
8 24
28
31 32 29 30
21 9
18 12 19
25 26
22 23
27
22 23
20
33 23 22
27 31
29 30
28 32 33 23 22
Hydraulic Pump End E–01406 E–01408
MODEL: farmboy, 440, 443 Ref.
Description
Ref.
Description
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.
RING, retaining SEAL, shaft WASHER RING, retaining RACE BEARING, thrust SHAFT, drive BEARING SCREW COVER SEAL WASHER BEARING HOUSING KEY PLATE, yoke ROTATING GROUP
18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36.
BUSHING O–RING COVER COVER PLUG O–RING SPRING VALVE, relief PLATE, back BOLT BOLT GASKET BEARING DOWEL SEAT SPRING KEY SHAFT, drive HOUSING
TAB 1 A–1
Hydrostatic Pump Component Repair Manual
PARTS IDENTIFICATION
18 10 11
12 13 14
17
18
16
10 11
15
12 13
36
17
16
14 14
7
1
54 6 45 2 3
14
8
35 20
9 25
21
22
19 13
26
10
1
4 23
9
19 25
13
29
29
30 31
32
33
33 34 24 23
10 28
23 24
28
22
26 27
27 23 24
20 21
54 56
30 31
32
34 24 23
E–01408 E–01406
MODEL: 540, 543 (S/N 12001 & Above) Ref.
Description
Ref.
Description
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
RING, retaining SEAL WASHER RING, retaining RACE BEARING, thrust KEY SHAFT, drive BEARING SCREW COVER SEAL WASHER BEARING HOUSING KEY PLATE, yoke ROTATING GROUP
19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36.
BEARING O–RING COVER COVER PLUG O–RING SPRING VALVE, relief PLATE, back BOLT BOLT GASKET BEARING DOWEL SEAT SPRING SHAFT, drive HOUSING
TAB 1 A–2
Hydrostatic Pump Component Repair Manual
HYDROSTATIC PUMP
A
THE ILLUSTRATIONS MAY NOT BE EXACTLY THE SAME AS THE HYDROSTATIC PUMP YOU ARE WORKING ON, BUT THE PROCEDURE IS THE SAME. Disassembly and Assembly The tool listed will be needed to do the following procedure: MEL–1219–4 – Torx Socket B–06422
B When repairing hydrostatic and hydraulic systems, clean the work area before disassembly and keep all parts clean. Always use caps and plugs on hoses, tubelines and ports to keep dirt out. Dirt can quickly damage the system. I–2003–0888
B–06419
NOTE: Before you begin to disassembly the hydrostatic pump, remove the hydraulic pump from the unit.
C
l Remove the charge tubeline [A]. l Remove the four replenishing valves from the pump [B]. l Remove the bolts and center bracket from the pumps [C]. l Assembly: Tighten the bolts to 27–31 ft.–lbs. (37–42 Nm) torque. l Separate the pump housing from the center section. B–06424
l Remove the coupler from the center section. l Remove the pintle levers from the pump.
D
L Remove the bolt and splined gear from the pump shaft [D]. L Assembly: Tighten the bolt to 25–28 ft.–lbs. (34–38 Nm) torque.
l farmboy, 440, 443 Procedure Only L 540, 543 Procedure Only
B–06057
TAB 1 A–3
Hydrostatic Pump Component Repair Manual
HYDROSTATIC PUMP (Cont’d)
A
L Remove the charge tubeline between the two pumps [A].
B–06058
B
L Remove the two bolts which fasten the two pumps together [B]. L Assembly: Tighten the bolts to 25–28 ft.–lbs. (34–38 Nm) torque. L Separate the pumps and remove the coupler.
B–06060
C
L Remove the plugs at the high pressure replenishing valves [C].
B–08843
L Remove the high pressure replenishing valves [D].
D
l farmboy, 440, 443 Procedure Only L 540, 543 Procedure Only
B–08844
TAB 1 A–4
Hydrostatic Pump Component Repair Manual
Thank you very much for your reading. Please Click Here Then Get More Information. NOTE: If there is no response to click on the link above, please download the PDF document first and then click on it.