Jacobsen AR3, Technical/Repair Manual

Page: 245 / 342

6-54 4181384 First Edition
HYDRAULICS
6
Backlap Valve
Removal and Installation
See Figure 6-51.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
2. Drain hydraulic oil.
Figure 6-51
NOTES
• Label all hydraulic hoses before disconnecting to
ensure correct installation.
• Close all openings with caps or plugs to prevent
contamination.
3. Disconnect four hydraulic hoses (1).
4. Remove mounting hardware (2). Remove backlap
valve (3) from mower.
NOTE
Record the location and orientation of fittings on lift valve
to ensure correct installation.
5. Remove fittings from backlap valve.
Installation Notes
• Install backlap valve by reversing the order of
removal.
• Ensure new O-rings are in place before installing
hoses on fittings.
• Replace hydraulic filter.
• Refill hydraulic tank. (Refer to “Safety, Operation, and
Maintenance Manual” for oil specifications.)
• Start engine and check backlap valve operation.
Check for leaks and repair as necessary.
Lift Cylinder
Removal and Installation
See Figure 6-52.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
2. Lower cutting units.
Figure 6-52
NOTES
• Label all hydraulic hoses before disconnecting to
ensure correct installation.
• Close all openings with caps or plugs to prevent
contamination.
3. Disconnect hydraulic hoses (2 and 12) from fittings
(3 and 11).
4. Remove pin (1), cotter pin (16), washer (15) and lift
arm pin (14) from lift arm (13).
5. Remove bolt (7), washer (8), lock nut (9), pivot shaft
(6) and lift cylinder pivot shaft spacers (5) from
cylinder (4) and frame (10), and remove cylinder from
mower.
TN1249
2
2
2
1
1
1
2
3
TN1122
1
16
14
2
15
13
4
5
6
12
3
7
8
9
10
11