Giant Comprehensive Repair Instructions for Your Septic System | Contact Industries

Page 10

Repair Instructions P420/P420-0011/P420-0021/P422/P423 and P425

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.

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 22 ft.-lbs. (30NM).

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.

11)After installation of high pressure seals (23), 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 30 ft.-lbs.(47 NM) in a crossing pattern

(as shown below).

6 4 2 7

8 1 3 5

Torque Specifications P420/P420-0011/P420-0021/P422/P423 and P425

Position

Item#

Description

U.S

Metric

15A

07311

Screw with Washer

97 in.-lbs.

11 NM

16D

08399

Tensioning Screw

22 ft.-lbs.

30 NM

32

08373

Plug (P420, P422, P423, P425)

107 ft.-lbs.

145 NM

34

08396/08484

Cap Screw

30 ft.-lbs.

40 NM

Contact Giant Industries for service school information. Phone: (419) 531-4600

10

Image 10
Contents P400 Series Installation Instructions Specifications ModelS P420A, P420A-0011, P420A-0021 P420 Horsepower RequirementsSpecifications Model P422 P422 Horsepower RequirementsSpecifications Model P423 P423HORSEPOWER RequirementsPage P420/P420-0011/P420-0021/P422/P423 and P425 Spare Parts List Specifications Model P425 P425 Horsepower RequirementsPage Position Item# Description Metric Pump System Malfunction Giant Industries Limited Warranty