Cutting Unit Motor; Lift Valve - Jacobsen AR-3 Technical/Repair Manual

HYDRAULICS
Assembly Notes
It is important that all components are absolutely
clean, as contamination can result in serious
damage and/or improper operation.
Never use shop towels or rags to dry parts after
cleaning, as lint may clog passages. Dry parts
using compressed air.
Required Materials
Seal Kit (Jacobsen P/N 4134713)
• Assemble the tandem pump by reversing the order of
disassembly.
• Use a new seal kit during assembly. Apply a coat of
clean hydraulic oil to all parts to ease assembly.
• Rotate drive shaft after assembling each section to
make sure there is no binding between parts; do not
force.
• Use extreme care when installing shaft seal. Seal
must seat squarely in seal bore. Use caution not to
damage seal when installing cover over pump shaft.
• Install retaining bolts finger-tight and rotate drive
shaft to make sure it turns freely. Tighten bolts evenly
in steps to a final torque of 32—36 lb-ft (43—49 N·m)
6
and check rotation of pump drive shaft.
• Lubricate pump through ports with clean hydraulic oil
prior to installation.

Cutting Unit Motor

Removal, Disassembly, Inspection, and
Assembly
NOTE
See Chapter 8—Cutting Units for cutting unit motor
service information:
• AR-3: See "Deck Drive Motor" on page 8-25.
• TR-3: See "Reel Drive Motor" on page 8-33.
6-46
NOTICE

Lift Valve

Removal and Installation
See Figures 6-40 and 6-41.
1. Park the mower safely. (See "Park Mower Safely" on
page 1-7.)
2
1
8
7
Figure 6-40
NOTE
Label all connectors before disconnecting to ensure
correct installation.
2. Mark and disconnect solenoid connectors (1, 2, 5,
and 6) from solenoids.
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 (3, 4, 7, and 8) from
fittings.
3
4
5
6
TN1120
4181384 First Edition