Flywheel Ring Gear 126 Teeth (fits Perkins) - KMP BRAND 31162121
High-quality flywheel ring gear — 126 teeth by KMP BRAND, compatible with a wide range of Perkins engines. This component transfers the starter motor torque to the flywheel during engine cranking. Manufactured from hardened steel for long service life and tooth wear resistance even under intensive use. KMP BRAND is a recognised manufacturer of Perkins engine parts, guaranteeing premium quality backed by years of proven market presence. Replaces part numbers: 31162121 (Perkins), 738588M1 (Massey Ferguson), 505079 (Ford/New Holland).
Technical Specification:
| Part Type |
Flywheel ring gear (hardened steel) |
|---|
| Parts Category |
Electrical System / Engine Starting / Flywheel |
|---|
| Part Number |
31162121 |
|---|
| Cross Reference Numbers |
738588M1 (Massey Ferguson) | 505079 (Ford/New Holland) |
|---|
| Number of Teeth |
126 |
|---|
| Outer Diameter (OD) |
404 mm |
|---|
| Inner Diameter (ID) |
371 mm |
|---|
| Thickness |
17.5 mm |
|---|
| Brand |
KMP BRAND |
|---|
Application — Perkins Engine Series:
1004 Series
1004.4 (AA, AG) · 1004.4T (AB, AH) · 1004.40 (AJ, AP)
1004.40T (AK, AM, AQ) · 1004.40TA (AL) · 1004.42 (AR, AS)
1006 Series
1006.6 (YA) · 1006.6T (YB) · 1006E.6T (YD)
1006.60 (YG) · 1006.60T (YH) · 1006.60TW (YK)
1103 Series
1103A-33 (DJ) · 1103A-33T (DK) · 1103C-33 (DC)
1103C-33T (DD) · 1103D-33 (XK)
1104 Series
1104A-44 (RR) · 1104A-44T (RS) · 1104A-44TA (RT)
1104C-44 (RE) · 1104C-44T (RG) · 1104C-44TA (RJ)
1104C-E44 (RF) · 1104C-E44T (RH) · 1104C-E44TA (RK)
1104D-44 (NK) · 1104D-44T (NL) · 1104D-44TA (NM)
1104D-E44T (NH, NP) · 1104D-E44TA (NJ)
1106 Series
1106A-70T (PP) · 1106A-70TA (PR) · 1106C-70TA (PT)
1106C-E60TA · 1106C-E66TA (PK, VK) · 1106D-70TA (PU)
1106D-E66TA (PJ) · 1106D-E70TA (PW)
1204 / 1206 Series
1204E-E44TA (MK, ML) · 1204F-E44TA (MT)
1206E-E66TA (BK) · 1206E-E70TTA (BL) · 1206F-E70TA (BM)
Classic 4 & 6 Cyl.
4.236 (CE) · 4.248 (LF) · A4.236 (LD) · A4.248 (LF) · T4.236
6.354 (TC) · 6.354.1 (TG) · 6.354.4 (TW) · T6.354 · A6.354
903 Series
903.27 (CP) · 903.27T (CR)
Engine Series Codes:
AA AB AD AE AF AG AH AJ AK AL AM AP AQ AR AS BK BL BM BN CE CJ CM CN CP CR DC DD DJ DK JD JE JF JG JR JS JT LD LE LF LG LJ LM MK ML NH NJ NK NL NM PJ PK PP PR PT PU PW RE RF RG RH RJ RK RR RS RT TC TE TF TG TH TJ TK TP TU TW TX TY TZ VK XC XE XK XN YA YB YD YE YG YH YK
⚠ Important — verify before ordering: Always confirm the tooth count (126) and dimensions (OD 404 mm / ID 371 mm / thickness 17.5 mm) against the ring gear fitted to your machine — many engine models are available with different tooth counts.
Workshop Technical Tip: The flywheel ring gear needs replacement when you notice chipped or worn teeth, difficulty starting with a known-good starter motor and battery, or a loud metallic clatter during cranking. The new ring gear is fitted using the heat-shrink method — heat it evenly to approximately 200–250°C (e.g. in an oven) and slide it onto the flywheel with the chamfer facing down. Never heat the ring gear with a direct flame at a single point — this risks localised hardening or warping. Once cooled, check that the ring gear seats flush and evenly around the full circumference. Always inspect the starter motor pinion when replacing the ring gear — a worn pinion will rapidly destroy a new ring.
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