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REPAIR INSTRUCTIONS - P430/P440, P450, AND P455
9) Check surfaces of plunger
(16). Damaged surfaces
cause accelerated seal wear.
Deposits of all kinds must be
removed from the plungers.
IMPORTANT! Plunger
surfaces are not to be
damaged. If there are lime
deposits in the pump, care
must be taken that the drip-
return bore in parts (25)
and (26) ensure trouble-free
drip-return.
11) After installation of high
pressure seals (23 - Note:
P422 and P423, also have a
support ring), place seal
adaptor (20) with weep seals
& pressure ring installed,
weep return ring (25) and high
pressure weep return ring (24)
over plungers. Slide valve
casing over plungers and seat
firmly. Replace the 8 socket
head cap screws (34) and
tighten to 35 ft.-lbs. in a
crossing pattern
(as shown to the right).
TORQUE SPECIFICATIONS - P430/P440, P450, AND P455
Position
Item#
15A
07311
16D
08399
32
06624
32
08406
34
08396/08484
Contact Giant Industries for service school information. Phone: (419) 531-4600
10) If the plunger pipe (16B), or
oil seal (19) is worn, remove
tension screw (16D) and re-
move along with plunger
pipe (16B). Check and clean
plunger surface (16A), check
oil scraper (16H). Remove
the gear seal adapter (20A)
and, if necessary, replace oil
seals with seal lips facing
crankcase (1).Cover thread
of tension screw (16D) with
a thin film of Loctite and
tighten carefully to 26 ft.-lbs.
(35NM).
4
6
2
8
1
3
Description
Screw with Washer
Tensioning Screw
Plug (P455)
Plug (P430, P440, P450)
Cap Screw
9
IMPORTANT! Care must be
taken that glue does not get
between the plunger pipe (16B)
and centring sleeve (16C). The
plunger pipe should not be
strained by eccentric tightening
of the tension screw or through
damage to front surface of
plunger, otherwise it is liable to
fracture.
7
5
U.S
216 in.-lbs.
240 in.-lbs.
125 ft.-lbs.
110 ft.-lbs.
35 ft.-lbs.
Metric
24.4 N-M
27.1 N-M
169.4 N-M
149.1 N-M
47.5 N-M
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