4S-600, 4SG-6004S-600, 4SG-60021/2”-10”21/2”-10”

Modification OverviewModification Overview

Production of the 4S-600 Production of the 4S-600 akaaka (DCDA4S) (DCDA4S) began in 1999.began in 1999.

The 4S-600 utilizes a ½” 4S-103 bypass.The 4S-600 utilizes a ½” 4S-103 bypass.

The 4SG-600 was introduced in 2008. The The 4SG-600 was introduced in 2008. The “G” indicates grooved end body.“G” indicates grooved end body.

Check Cover RemovalCheck Cover Removal Cover is sealed by a Cover is sealed by a

gasket.gasket. Cover has no spring Cover has no spring

load.load. For the 21/2”-6” size, For the 21/2”-6” size,

unscrew black plastic unscrew black plastic spring cap.spring cap.

Remove bolts, cover Remove bolts, cover and gasket.and gasket.

8-10” – cover has 8-10” – cover has spring load spring load approximately ¼”.approximately ¼”.

Check Valve RemovalCheck Valve Removal

Check valve module.Check valve module. Module is o-ring Module is o-ring

sealed.sealed. 8”-10”- spring module 8”-10”- spring module

is separate from the is separate from the check module.check module.

Gently pry the module Gently pry the module from the body.from the body.

Disassemble Check Valve 2½” - 6”Disassemble Check Valve 2½” - 6” The module is spring The module is spring

loaded.loaded.** Do not remove the ** Do not remove the

socket head bolt.socket head bolt. Unscrew and remove Unscrew and remove

the spring assembly the spring assembly from the module by from the module by placing a wrench on placing a wrench on the flats provided.the flats provided.

Do not disassemble Do not disassemble spring assembly any spring assembly any further.further.

Check Disc Replacement 2½” – 6”Check Disc Replacement 2½” – 6”

Once the spring Once the spring assembly is removed, assembly is removed, spring load is spring load is released.released.

Remove the retaining Remove the retaining screws and disc screws and disc retainer.retainer.

Remove the seat Remove the seat disc.disc.

Disassemble Check Valve 8”-10”Disassemble Check Valve 8”-10”

The check module is The check module is made of brass.made of brass.

The spring module is The spring module is self contained and is self contained and is free once the cover free once the cover has been removed.has been removed.

Do not disassemble Do not disassemble spring assembly any spring assembly any further.further.

Check Disc Replacement 8”–10”Check Disc Replacement 8”–10”

Remove the retaining Remove the retaining screws and disc screws and disc retainer.retainer.

Remove seat disc.Remove seat disc.

Check Seat RemovalCheck Seat Removal

The check seat is part The check seat is part of the check module of the check module and can not be and can not be removed.removed.

If the seat is If the seat is damaged, the damaged, the complete check complete check module will need to module will need to be replaced.be replaced.

Check Valve Reassembly Notes Check Valve Reassembly Notes 2½”-6”2½”-6”

Reassemble checks Reassemble checks in reverse order.in reverse order.

Lubricate o-rings.Lubricate o-rings. A pry bar may be A pry bar may be

needed to aid in needed to aid in seating the check seating the check assembly into the assembly into the body.body.

Spring cap needs Spring cap needs only to be snug.only to be snug.

Check Valve Reassembly Notes Check Valve Reassembly Notes 8”-10”8”-10”

8”-10”- Insure that the 8”-10”- Insure that the cam positioner is cam positioner is flipped down on the flipped down on the swing arm of the swing arm of the check module.check module.

8”-10”- When 8”-10”- When replacing the spring replacing the spring assembly, make sure assembly, make sure to place cam end of to place cam end of spring on both cam spring on both cam rollers of the check rollers of the check module.module.