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1. With a 27mm wrench,
remove the three discharge
plugs (#48) and three inlet
plugs (#42A) from the
manifold (#43).
2. Inspect the plug o-rings
(#48A and #42B) and
replace as necessary.
3. Using a valve puller (avail-
able from Snap-On-Tools),
remove the valve assembly
(#44 - #47).
REPAIR INSTRUCTION - MP4130HT(C)
Disassembly sequence of the GIANT MP4130HT(C) Series Pumps
4. Inspect all parts, especially the seating surface of
the valve plate (#45), and replace as necessary.
5. Remove the six manifold
stud nuts (#50) with a
19mm wrench. Remove
the spring washers
(#50A).Tap the back of the
manifold with a rubber
mallet to dislodge and slide
it off the studs (#49).
6. To remove the inlet valve
assembly, insert a 13mm
socket with extension
through the rear of the
inlet manifold (#43) port
and tap it firmly with a
hammer. This will force
the tension spring (#46),
valve housing (#52) and the
remainder of the inlet valve
assembly out through the
front of the inlet port.
7. Pull the inlet valve assembly apart for inspection. Any resistance
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.
51 44 44A 45 46 52
47 46 45 44A 44