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REPAIR INSTRUCTION - MP4130-3100 & MP4135-3100
Disassembly sequence of the GIANT MP4130-3100 & MP4135-3100 Series Pumps
1. With a 27mm wrench,
remove the three dis-
charge plugs (#48) and
three inlet plugs (#42A)
from the manifold (#43).
47
46
4. Inspect all parts, especially the seating surface of
the valve plate (#45), and replace as necessary.
6. To remove the inlet valve
assembly, insert a 13mm
socket with extension
through the rear of the in-
let manifold (#43) port and
tap it firmly with a ham-
mer. This will force the
tension spring (#46), valve
housing (#52) and the re-
mainder of the inlet valve
assembly out through the
front of the inlet port.
2. Inspect the plug o-rings
(#48A and #42B) and
replace as necessary.
45
44A
44
51
7. Pull the inlet valve assembly apart for inspection. Any resis-
tance may be overcome by placing the valve housing (#52)
in a brass jawed vise and carefully tapping the back of the
valve plate (#45) with a screwdriver. Remove the spacer
pipe (#51) valve seats (#44), o-ring (#44A), valve plate (#45),
spring (#46), replace them as necessary.
3. Using a valve puller (avail-
able from Snap-On-Tools),
remove the valve assem-
bly (#44 - #47).
5. Remove the six manifold
stud nuts (#50) with a
19mm wrench. Remove
the spring washers (#50A).
Tap the back of the mani-
fold with a rubber mallet to
dislodge and slide it off the
studs (#49).
44
44A
45
6
46
52
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