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LP122A/LP122A-4000/LP123/LP255 - Repair Instructions
1. With a 30mm wrench, re-
move the six (6) plugs
(48) from the valve cas-
ing (43). Inspect the o-
rings (48A) and replace if
necessary.
Remove the complete
valve assembly (46A) by
threading a 12mm bolt
into the spring retainer and
pulling straight out.
2. To disassemble the valve, screw the bolt into the retainer
until the valve plate (45) presses the valve seat (44) out of
the spring retainer. Examine all parts and replace if neces-
sary. If the seat doesn’t come out, use a valve puller to
remove.
3. Remove the eight (8) hex
nuts (49A) with a 19mm
wrench. Tap the back of
the manifold (43) with a
rubber mallet to dislodge
and slide off the studs.
4. Remove the seal sleeve (35) from the manifold and/or
crankcase. Remove the pressure rings (39&36A), v-sleeves
(40&36), support ring (41) and o-rings (35A and 35B in
Lp255A only) from the manifold and seal sleeve, respec-
tively. For LP255 only, remove support ring (37). Examine
seals carefully and replace if worn. Clean all parts.
6. Inspect surface of plunger pipe (29B) carefully. Remove
any chemical or mineral deposits taking care not to damage
the surface of the plunger. If plunger pipe is worn, remove
the plunger bolt (29C) , plunger pipe (29B) and spacer
(29E). Replace worn parts necessary. Note:
Always use a
new copper gasket (29) when repairing the plunger assem-
bly.
5. If there are signs of
oil leaking through the
plunger oil seals, then
replacment is neccessary.
Dissassemble the gear
end and push out the
seals from the back of
the pump.
29E 29A 29B 29D 29C
36A 36 35 35A 35B 39 40 40 41 37
(LP255 only) (LP255 only)
44A 44 45 48 47