John Deere SPRAYMASTER 4700 - Manual (Page 4)

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PLUNGER REPLACEMENT
PMKIT2746
1. If damage to the Plungers is noted during Packing Replacement,
continue with Plunger Replacement.
2. Remove the Pump Head from the Crankcase as described in
PACKING REPLACEMENT.
3. Remove the Plunger Retaining Nut and the Plunger Retaining
Nut Washer; then, carefully slide the Plunger off the Lower
Plunger (See Figure 10).
4. Remove and discard the old O-ring and Slinger Ring from the
Lower Plunger (See Figure 10).
5. Install the new Slinger onto the loser Plunger.
6. Apply a thin film of oil to the Lower Plunger; then, install the new
O-ring.
7. Slide the Plunger onto the Lower Plunger.
8. Apply a drop of blue anaerobic thread locking compound to the
Plunger Retaining Nut; then, install the Plunger Retaining Nut
and Washer onto the Lower Plunger.
9. Tighten the Plunger Nut to 88 in lbs.
10. Install the new Plunger Packings as described in PACKING
REPLACEMENT.
Hydraulic Motor Repair Instructions
HYDRAULIC MOTOR DISASSEMBLY
CAUTION: Dirt and other contaminants can damage hydraulic
motor components. Always maintain a clean work area when
working with hydraulic motors or components.
1. Place the Hydraulic Motor in a vise (See Figure 11).
2. Using a 1-1/16’’ Box wrench, remove the Tank Port Adapter and
Pressure Port Adapter (See Figure 11).
3. Using a 1/4’’ Hex wrench, remove the Socket Head Cap Screws
from the Motor End Plate (See Figure 11).
FIGURE 10
O-ring
&
Slinger Ring
Plunger
Lock
Washer
Plunger
Retaining Nut
FIGURE 11
FIGURE 12
Tank Port
Adapter
Pressure Port
Adapter
Socket Head
Cap Screws
NOTE: If the Motor End Plate will not lift off easily, use a small
screwdriver to carefully pry apart the boss portion of the End
Plate and Gerotor Housing (See Figure 12). If the Gerotor
Housing will not easily lift off, carefully pry apart the boss area
between the Gerotor Housing and the Motor Body.
4. Remove bottom parts of the Gerotor.
5. Remove and save the Shaft Key.
6. Remove and discard the old O-ring from the Motor End Plate and
Body.
7. Inspect the Motor End Plate, Body, and Gerotor Housing for
signs of wear or gouging. If wear or gouging has occurred in both
the Motor End Plate, and Body, these components must be
replaced. If the Gerotor Housing is damaged, the Gerotor parts
must also be replaced.
8. While the Motor is disassembled, clean all components in an
approved part cleaning solvent.