Pump repair instructions – John Deere SPRAYMASTER 4700 User Manual
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Pump Repair Instructions
PACKING REPLACEMENT
PMKIT2747 and PMKIT2745
1.
Water leakage between the Head and the Crankcase indicates
the Plunger Packings require replacement.
2.
Use a Hex wrench to remove the Head Bolts; then, remove the
Head from the Crankcase by rotating the Crankshaft while using
a screwdriver to carefully pry between the Head and the
Crankcase (See Figure 6).
3.
After the Head has been removed, use an Extractor Pliers
to remove the Plunger Seal Retainers, and Packings (See
Figure 7).
4.
Using a small bladed screwdriver, remove the Low Pressure
Packing from the Retainer.
5.
Insert a Low Pressure Packing into the Retainer by forming the
Seal into a kidney or oval shape; then, work the Seal into place
in the Retainer.
6.
Apply a thin film of oil the Retainer O-ring; then, replace the
Retainer O-ring.
7.
Apply a thin film of oil to all Seals; then, place the High Pressure
Packing and Cup Spreader into the head bore.
8.
Place the Brass Packing Retainer into the Head and push the
Retainer in until the Retainer O-ring is sealed in the Head.
9.
Check the Plungers for damage or cracking (refer to Plunger
Replacement section).
10. Repeat Steps 5 through 8 for the rest of the Cylinders.
11. Lightly oil the Plungers and install the Head onto the Plungers.
12. Push the head against the Crankcase; then, secure the Head to
the Crankcase with the Head Bolts.
13. Tighten the Head Bolts to 88 in lbs. torque, in the sequence
shown (See Figure 8).
VALVE REPLACEMENT
PM34300424
1.
Erratic or low pressure operation may be caused by debris or
foreign material in the Valves or worn Poppets or a combination
of worn Poppets and/or Seats.
2.
Remove the Valve Caps; then, using a needle-nosed plier, pull
out the Valve Assembly (See Figure 9).
3.
Inspect the Valve for debris or foreign material and signs of wear.
If the Valve is worn or damaged, replace the Valves and the
valve O-rings.
4.
Install the new Valve Assemblies; then, install the Valve Caps
and tighten them to 25 ft lbs. torque.
FIGURE 6
FIGURE 7
FIGURE 8
FIGURE 9
Extractor Pliers
Plunger Seal
Retainers, and
Packing
Valve
Assembly
Valve Cap