Textron JACOBSEN GP400, Technical/Repair Manual

Page: 237 / 354

HYDRAULICS
4252490-Rev A 6-45
6
Disassembly Notes
• Do not disassemble pump for repair unless test
procedures indicate internal leakage.
• Never pry components apart. Use a soft-faced
hammer, and gently tap housing and shaft to
separate pump bodies.
• Scribe or mark the pump bodies and end covers
before disassembly to aid in assembly.
Recommended method of marking body sections is
to use a fine point metal punch, making one
indentation for section #1, two indentations for
section #2, etc.
Figure 6-46
1. After removing bolts, disassemble pump. Before
removing gear set, mark a line across meshing teeth
to ensure that gears are reassembled in the same
position.
2. Place parts, in assembly order, on a clean work area
as they are removed.
3. Discard seals as they are removed.
!
WARNING
NOTICE
4. Clean all parts using clean solvent, and dry using
compressed air.
5. Inspect all parts for cracks, nicks, burrs, and
excessive wear. Inspect for scoring, galling, and
scratches on surfaces. Damage or excessive wear to
gear pump components other than seal kit
components (5, 11, 12, and 16) requires gear pump
replacement.
6. Inspect remaining gear pump components for
excessive wear or damage. Replace gear pump if
necessary.
Assembly Notes
NOTICE
• Assemble gear 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.
• Remove alignment mark from gear sets after gears
have been installed with teeth in proper mesh.
• Make sure that bushing sets are correctly installed to
properly position the high-pressure seals.
• Rotate drive shaft by hand 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 screws (10) finger-tight and rotate
drive shaft to make sure it turns freely. Tighten
retaining screws (10) evenly in steps to a final torque
of 88 lb-ft (120 N·m) and check rotation of pump drive
shaft.
• Tighten outlet port fitting (1) to 77 lb-ft (105 N·m).
• Tighten inlet port fitting (2) to 133 lb-ft (180 N·m).
• Lubricate pump through ports with clean hydraulic oil
prior to installing.
Use appropriate eye protection when using
compressed air for cleaning or drying purposes.
Compressed air can cause serious personal
injury. Use safety reduction valves to reduce the
air pressure to a safe level before use.
It is important that all component parts 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.
TN1384
It is important that all component parts 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