Jacobsen AR3, Technical/Repair Manual

Page: 170 / 342

HYDROSTATIC POWER TRAIN
4181384 First Edition 5-23
5
1. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
2. Remove the seat and mounting plate. (See Seat and
Mounting Plate on page 9-16.)
3. Drain hydraulic oil tank.
4. Remove pump drain plug and drain hydraulic oil from
pump.
5. Remove tandem pump. (See “Tandem Pump” on
page 6-44.)
NOTES
• Label all hydraulic hoses to ensure correct
installation.
• Close all openings with caps or plugs to prevent
contamination.
6. Loosen clamp (43) and disconnect hose (42) from
fitting (6).
7. Disconnect hoses (1 and 3) from fitting (2).
8. Disconnect hose (4) from fitting (5).
9. Disconnect hose (9) from reducer fitting (7).
10. Disconnect hoses (10 and 12) from tee-fitting (11).
11. Disconnect hose (14) from tee-fitting (15).
12. Disconnect hose (16) from elbow fitting (20).
13. Remove nut (34), screw (30), and spacer (35), and
disconnect control rod (33) from control arm (36).
!
WARNING
14. Attach a suitable lifting device to the engine to
support the engine weight.
15. Attach a suitable lifting device to the pump to support
the pump weight.
16. Remove nut (27), screw (21), two flat washers (26),
washer (29), and bushing (28) from both sides of
bracket (22) and frame (25).
17. Remove two socket-head screws (19), lock washers
(18), and flat washers (17) (top and bottom) from the
hydrostatic pump (38) and bell housing.
18. Slide pump (38) away from engine to disengage
pump hub (39) from engine.
19. Lift hydrostatic pump (38) with bracket (22) from
mower frame (25).
20. Remove two screws (24) and washers (23), and
remove bracket (22) from pump (38).
21. Loosen screw (40) and remove pump hub (39) from
end of pump shaft (41).
NOTE
Note orientation of fittings on pump body to aid in
assembly.
22. Remove fittings (2, 6, and 8) from pump (38).
23. Remove tee-fitting (5) and reducer fitting (7) from
pump (38).
24. Remove tee-fitting (15) and reducer fitting (13) from
pump (38).
25. Remove elbow fitting (20) from pump (38).
26. Remove nut (31), screw (37), and washers (32), and
remove control arm (36) from pump (38).
Installation Notes
• Install the hydrostatic pump by reversing the order of
removal.
• Tighten pump hub screw (40) to 37 lb-ft (50 N·m).
• Ensure new O-rings are in place before installing
hoses on fittings.
• Replace hydraulic filter.
• Fill the hydraulic tank. (Refer to “Safety, Operation,
and Maintenance Manual” for the correct oil
specifications.)
• Start engine. Check for leaks and repair as
necessary.
The engine weighs approximately 214 lb (97 kg).
Prevent personal injury. Use a properly rated lift
device. Always be sure the load is balanced
before lifting.