Rebuilding an air cylinder is a cheap way to restore an air cylinder to proper operation. The internal piston seals will begin to leak air and function of the valve may be compromised. Usually you can diagnose a piston leak when listening for air bypass at the air pilot manifold. There should never be air constantly bypassing out of an air pilot valve. See the attached procedure on how to rebuild an air cylinder.
On Flow Stop cylinders on a CBW, a single piston leak can influence the function of the other valves tied to the same air supply. See the note on how to troubleshoot this problem here.
Video - Why is my shuttle valve leaking air?Rebuild kits/parts are available for most air cylinders. A list of rebuild kits are listed below.
AVD48701 - 4"DUMP BONNET&AIRCYL DBL-ACT
Flow Stop Air Cylinder.
Kit
KZRKDVDA01 - REPAIR KIT 4"DUMP VLV DBL-ACT.
This has been replaced by the
A64DV012.
A64DV012 - ASSY=4" DUMP VALVE N/C FLOW/STOP
Flow Stop Air Cylinder
Kit
KZRKDVDA01 - REPAIR KIT 4"DUMP VLV DBL-ACT.
A64DV004 - BONNET DUMPVAL NC G3 is the drain valve air cylinder for a G3 and a G4 CBW.
Kit
KTWBDVRK01 - DUMPVALVE A64DV004 REPAIR KIT
Air Cylinder Only
Kit
KTWDVACR01 - G3/G4 DRAIN VALVE AIR CYL REPAIR KIT
A64AC001A - N/C DUMP VAL AIR CYL 4+1/2X8 is the drain valve for a classic CBW.
Kit
KTNCDVAC01 - REPAIR KIT A64AC001A
A65AC001 - 7639=AIR-CYL FLOWNOT VLV ASY is the flow not air cylinder.
Kit
KTFNACRK02 - 7639 REPAIR FLO NOT AIR CYL
A14 06400 - BONNET+CYL=4"SS DIVCYL DUMP is the air cylinder for the reuse tank drain.
Kit
KZRDV00100 - REPAIR DUMP VALVE A14 06400
A62 06000 - AIR CYL.-FLOW NOT VALVE - FLOWNOT AT LOAD/UNLOAD
Kit
KTFNACRK01 - 7632 REPAIR FLOW NOT AIR CYL
KZRKDVDA01
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
|---|
 | 02 02185
02 02194A
02 18932B
03 01313S
60C132V
02 16021E
60C108V
02 11740D
02 02085
02 02105B
02 16021H
15G220
15G219A
24G020N
60C106V
02 14447B | WASHER=PISTON CUP COMP LIMIT
PISTON CUP 2.375X.750=VITON
GASKET=DUMPVAL 1/8"RED SILIC
+STOP=AIRCYL W/2+11/16STR.SS
ORING 2"ID3/16CS VITON75 #329
WASHER 3/8IDX1.250D DUMPVAL
ORING 1/2IDX3/16CS VITON #310
SEAT=4"S/S VENT=RED SILICONE
UP WASHER=2"OD=PISTON CUP
2.38"ACYL BRASS PISTNCUP WSHR
BUMPER=DMPVAL BON'T RED SILC
NUTLOK THINHX 3/8-24 SS/NYL
LOKNUT 3/8-24 NF2 18-8 SS
ROLLED WASH.252ID NYLTITE 25W
ORING 5/16IDX1/16CSVITON#011
GASKET=BON 4"S/S DPVAL RED |
2
2
1
1
2
1
2
1
2
1
1
1
1
8
2
1
|
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
 | 15G220
60C108
60C132
02 02105B
02 18932B
24G020N
60C106
06 40065A
02 16021H
02 02194 | NUTLOK THINHX 3/8-24 SS/NYL
ORING 1/2IDX3/16CS BUNA70#310
ORING 2"IDX3/16CS BUNA70 #329
2.38"ACYL BRASS PISTONCUP WSHR
GASKET=DUMPVAL 1/8"RED SILIC
ROLLED WASH.252ID NYLTITE 25W
ORING 5/16ID 1/16CSBUNA70#011
DUMP VLV CUP GSKT RED SILICONE
BUMPER=DMPVAL BON'T RED SILC
PISTON CUP=DUMPVALVE 2+3/8" | 1
2
2
1
1
9
2
1
1
2 |
KTWDVACR01 - BACK TO TOP
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
|---|
 | 60C132
60C108
02 02194
02 02185
02 02085
02 02105B
60C106
02 18931F
15G220 | ORING 2"IDX3/16CS BUNA70 #329
ORING 1/2IDX3/16CS BUNA70#310
PISTON CUP=DUMPVALVE 2+3/8"
WASHER=PISTON CUP COMP LIMIT
UP WASHER=2"OD=PISTON CUP
2.38"ACYL BRASS PISTONCUP WSHR
ORING 5/16ID 1/16CSBUNA70#011
GASKET=DUMPVALVE-1/60+72WEHU
NUTLOK THINHX 3/8-24 SS/NYL | 2
2
2
2
2
2
2
1
1 |
KTNCDVAC01 - BACK TO TOP
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
|---|
 |
60C106
02 16021D
02 16021H
02 16021E
06 40064
06 40065A
06 40069G
60C134
06 20537
03 01618
02 18651
03 01630
02 19302
| ORING 5/16ID 1/16CSBUNA70#011
DUMP VALVE BUMPER RETAINER
BUMPER=DMPVAL BONT RED SILC
WASHER 3/8IDX1.250D DUMPVAL
DUMP VALVE GASKET RETAINER
DUMP VLVE CUP GSKT RED SILC
N/C DBL ACT DYE DMP VLV GSKT
ORING 2.5ID3/16CS BUNA70 #333
2+7/8 AIR CYL SPRING DIVIDER
PISTON CUP WASHER 3"AIRCYL
WASHER=2 WAY BRAKE CYL
3"AIRCYL PSTNCUP CMPLMTWSH
PISTON CUP 2+7/81D CYLINDER |
3
1
1
1
1
1
1
2
1
2
1
2
2
|
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
|---|
 | 02 02085
02 02101S
02 02105B
02 02185
02 16021C
02 16021D
02 16021E
03 01313S
06 50083
15G220
24G020N
27B260156S
60C106
60C110
60C132
06 20702C
02 02194
24G027N | UP WASHER=2"OD=PISTON CUP
CYLINDER HEAD TAP.HOLE (SS)
2.38"ACYL BRASS PISTNCUP WSHR
WASHER=PISTON CUP COMP LIMIT
BUMPER=DUMP VALVE BONNET
DUMP VALVE BUMPER RETAINER
WASHER 3/8IDX1.250D DUMPVAL
+STOP=AIRCYL W/2+11/16STR.SS
7639=FLOW NOT VLV GSKT NEOPR
NUTLOK THINHX 3/8-24 SS/NYL
ROLLED WASH.252ID NYLTITE 25W
SPCRSLD.26ID.375OD.156L 316SS
ORING 5/16ID 1/16CSBUNA70#011
ORING 1/2IDX3/32CS BUNA70 #112
ORING 2"IDX3/16CS BUNA70 #329
FLOW NOT VALVE GASKET
PISTON CUP=DUMPVALVE 2+3/8"
ROLLED WASH.312ID NYLTITE 31W | 2
1
1
2
1
1
1
1
2
2
3
6
2
2
2
2
2
4 |
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
|---|
 | 60C132
03 01313S
02 02085
02 02194
02 02105B
60C106
02 18651
02 02185
02 18931F
02 16021E
02 16021C
02 14446
02 14443
24G030N
24G020N
02 14166 | ORING 2"IDX3/16CS BUNA70 #329
+STOP=AIRCYL W/2+11/16STR.SS
UP WASHER=2"OD=PISTON CUP
PISTON CUP=DUMPVALVE 2+3/8"
2.38"ACYL BRASS PISTONCUP WSHR
ORING 5/16ID 1/16CSBUNA70#011
WASHER=2 WAY BRAKE CYL
WASHER=PISTON CUP COMP LIMIT
GASKET=DUMPVALVE-1/60+72WEHU
WASHER 3/8IDX1.250D DUMPVAL
BUMPER=DUMP VALVE BONNET
DISC-4"S/S DUMP VALVE
GASKET-4"S/S DUMP VAL BONNET
ROLLED WASH.379ID NYLTITE 37W
ROLLED WASH.252ID NYLTITE 25W
SEAT 4" DUMP VALVE BUNA-N | 2
1
1
1
1
1
1
1
1
1
1
1
1
8
4
1 |
| KIT PICTURE | COMPONENT | DESCRIPTION | QTY |
 |
02 02085
02 02101S
02 02105B
02 02185
02 16021C
02 16021D
02 16021E
03 01313S
06 20702A
06 20702C
06 20702E
15G220
24G020N
27B260156S
60C106
60C110
60C132
02 02194 |
UP WASHER=2"OD=PISTON CUP
CYLINDER HEAD TAP.HOLE (SS)
2.38"ACYL BRASS PISTONCUP WSHR
WASHER=PISTON CUP COMP LIMIT
BUMPER=DUMP VALVE BONNET
DUMP VALVE BUMPER RETAINER
WASHER 3/8IDX1.250D DUMPVAL
+STOP=AIRCYL W/2+11/16STR.SS
FLOW NOT VALVE GASKET RET.
FLOW NOT VALVE GASKET
FLOW NOT ACTUATOR CYL HEAD
NUTLOK THINHX 3/8-24 SS/NYL
ROLLED WASH.252ID NYLTITE 25W
SPCRSLD.26ID.375OD.156L 316SS
ORING 5/16ID 1/16CSBUNA70#011
ORING 1/2IDX3/32CS BUNA70 #112
ORING 2"IDX3/16CS BUNA70 #329
PISTON CUP=DUMPVALVE 2+3/8" |
2
1
1
2
1
1
1
1
2
2
1
2
3
6
2
1
2
2
|
