ALX SERIES ALTERNATORS

Current Factory Engine/

Alternator Replaced Alternator Overhaul Airframe
Part No. By Part No. Part No. Application
ALX6408 Use ALX6523 ALX6523R Teledyne Continental Motors
ALX6423 Use ALX6523 ALX6523R Teledyne Continental Motors
ALX8403 Use ALX8521 ALX8521R Lycoming
ALX8403G Use ALX8521 ALX8521R Lycoming
ALX8403LS Use ALX8521LS ALX8521RS Lycoming
ALX8403LSG Use ALX8521LS ALX8521RS Lycoming
ALX8403R Use ALX8521 ALX8521R Lycoming
ALX8403RG Use ALX8521 ALX8521R Lycoming
ALX8403RS Use ALX8521LS ALX8521RS Lycoming
ALX8403RSG Use ALX8521LS ALX8521RS Lycoming
ALX8421 Use ALX8521 ALX8521R Lycoming
ALX8421G Use ALX8521 ALX8521R Lycoming
ALX8421LS Use ALX8521LS ALX8521RS Lycoming
ALX8421LSG Use ALX8521LS ALX8521RS Lycoming
ALX8421R Use ALX8521 ALX8521R Lycoming
ALX8421RG Use ALX8521 ALX8521R Lycoming
ALX8421RS Use ALX8521LS ALX8521RS Lycoming
ALX8421RSG Use ALX8521LS ALX8521RS Lycoming
ALX9402 Use ALX9525B ALX9525BR Teledyne Continental Motors
ALX9404L Use ALX9522 ALX9522R Lycoming
ALX9404LG Use ALX9522 ALX9522R Lycoming
ALX9404RG Use ALX9522 ALX9522R Lycoming
ALX9405 Use ALX9524 ALX9524R Teledyne Continental Motors
ALX9422L Use ALX9522 ALX9522R Lycoming
ALX9422LG Use ALX9522 ALX9522R Lycoming
ALX9422R Use ALX9522 ALX9522R Lycoming
ALX9422RG Use ALX9522 ALX9522R Lycoming
ALX9424 Use ALX9524 ALX9524R Teledyne Continental Motors
ALX9425 Use ALX9525B ALX9525R Teledyne Continental Motors
ALX9425A Use ALX9525B ALX9525BR Teledyne Continental Motors
ALX9425B Use ALX9525B ALX9525BR Teledyne Continental Motors
KELLY AEROSPACE ALTERNATORS/STARTERS

OE-A-Z Manual states on page 6-30-01 the following: "Note: The R at the end of a starter part no. signifies
overhauled." See parts list for motor being serviced when component parts are required.

Exploded view of a typical ALX Series alternator

North America and AOG 1.800.AVIALL.1

372 aviall.com International Sales 1.800.AVIALL.3 or +1 972.586.1985
ALX SERIES ALTERNATORS
ALX Series Service Parts (cont’d)

ALX8403LS, RS, LSG, RSG

ALX8421LS, RS, LSG, RSG

ALX9404L, LG, R, RG

ALX9422L, LG, R, RG
ALX8403, G, R, RG

ALX8421, G, R, RG

ALX9425, A, B
ALX8521LS

ALX9525B
ALX6408
ALX6423
ALX6523

ALX8521

ALX9402

ALX9405

ALX9424

ALX9522
ALX9524
No. Description Part No.
1* Nut and washer package 90-33 • • • • • • • • •
8X40755 • • • • •
ALU23 6 •
Not applicable • • •
2 Drive pulley 4
• • • • • •
PU672A • • •
Not applicable • • • • • • • • •
3 Vent fan (2 pieces) 90-2259 • • •
90-2241 • • • • • •
ALP1034 7 • • •
Not applicable • • • • • •
4 Rotor shaft spacer ALC21F • • •
ALD21 • • • • • •
ALU236 • • • • •
Not applicable • • • •
5 Drive end head assembly ALE1003R • • •
ALE1003K • • • • • •
ALU1003 • • •
ALU1043 4 • • • • • •
6* Drive end bearing X4612 • • • • • • • • • • • •
X4087 • • • • • •
7 O-ring seal Not applicable • • • • • • • • • • • • • • • • • •
8 Drive end retainer GR32 • • • • • • • • • • • • • • • • • •
9 Rotor assembly 90-2516 3 • •
ALH2228S1 • • •

KELLY AEROSPACE ALTERNATORS/STARTERS

90-2508 3 • • • •
90-2505 3 • •
90-2509 3 • •
90-2504 3 • •
ALH2238S1 • •
ALH2306S1 •
10 Stator assembly ALE2008AB • • • • • • • • • • • • • • • • • •
11* Thru-bolt package ALA20GS • • • • • • • • • • • • • • • • • •
12* Eyelet package 90-818 • • • • • • • • • • • • • • • • •
8X4075 6 •
13* Negative rectifier package XA944JS • • • • • • • • • • • • • • • • • •
14 Slip ring end head assembly 90-2516 3 • •
ALK1232AS2 •
90-2508 3 • • • •
ALK1232AS2 •
90-2502 3 •
90-25053 • •
90-2509 3 • •
90-2504 3 • •
ALE1242AAS2 • • •
* Items represent mandatory replacement parts required at each overhaul and are available in repair kits. See item 21.
3
S.R.E. head and rotor kit must be used at time of first repair/overhaul. Individual components may be used thereafter. Contents of 90-2505 S.R.E. head and rotor kit: S.R.E. head assembly with bearing – ALK1242AAS2; brush holder
assembly – ALU2045BS; rotor assembly – ALH2306S1. Contents of 90-2508 S.R.E. head and rotor kit: S.R.E. head assembly with bearing – ALK1232CS2; brush holder assembly – ALU2045BS; rotor assembly – ALH2228S1
4
Available through engine or airframe OEM
5
Also included with rotor
6
Nut only; washer not included

aviallability aviall.com 373

 ALX SERIES ALTERNATORS
ALX Series Service Parts (cont’d)

ALX8403LS, RS, LSG, RSG

ALX8421LS, RS, LSG, RSG

ALX9404L, LG, R, RG

ALX9422L, LG, R, RG
ALX8403, G, R, RG

ALX8421, G, R, RG

ALX9425, A, B
ALX8521LS

ALX9525B
ALX6408
ALX6423
ALX6523

ALX8521

ALX9402

ALX9405

ALX9424

ALX9522
ALX9524
No. Description Part No.
15* Positive rectifier and plate assembly ALE1054A 8 • • • • • • • • • • • • • • • • • •
16* Terminal stud package 90-2043 • • • • • • • • • • • •
90-2030 • • • • • •
17 Brush holder and spring assembly ALU2045BS 2 • • • • • • • • • • • • •
ALU2045BS • • • • •
18* Brush set ALE2013AS 2 • • • • • • • • • • • • •
ALE2013AS • • • • •
19* Slip ring end bearing X4130 1 • • • • • • • • • • • • •
X4130 • • • • •
20 Slip ring end cover ALU1062A • • • • • •
ALX1062S • • •
Not applicable • • • • • • • • •
21 Repair kit 90-3043 • • •
90-3044 • • • • • •
90-3045 • • •
90-3046 • • • • •
90-3047 •
* Items represent mandatory replacement parts required at each overhaul, and are available in repair kits. See item 21.
1
S.R.E. bearing is included with S.R.E. head and rotor package
2
ALU2045BS or ALE2045BS brush holder and spring assembly is included with S.R.E. head and rotor packages. ALE1013AS captive brush and spring sets are still available for units containing the superseded ALU1045BS or ALE1045BS
brush holder design. The superseded ALU1045BS or ALE1045BS must be replaced at overhaul with the latest configuration.
8
Rectifier diode package available separately – part no. XA943FS.
KELLY AEROSPACE ALTERNATORS/STARTERS

North America and AOG 1.800.AVIALL.1

374 aviall.com International Sales 1.800.AVIALL.3 or +1 972.586.1985