Komatsu Dozer Track Tensioner & Recoil Spring

Track tensioners, recoil springs, adjuster cylinders, spring covers, yokes, pistons, and seal kits for Komatsu crawler dozers — covering D20 through D85 series machines across multiple generations. Both left-hand and right-hand components are available individually or as complete assemblies, with many parts Made in USA by PVE Manufacturing.

Fits Models At A Glance

• D20 / D21 Series: D20P-6, D20P-7, D20P-8, D21P-6, D21P-7, D21P-8
• D31 Series: D31A-16, D31A-17, D31AM-20, D31E-18, D31E-20, D31P-16, D31P-17, D31P-18, D31P-18A, D31P-20, D31P-20A, D31PL-18, D31PX-21, D31PX-22, D31Q-18, D31Q-20, D31S-16, D31S-17, D31S-18, D31S-20
• D37 Series: D37A-5, D37E-1, D37E-2, D37E-5, D37P-2, D37P-5A
• D41 Series: D41P-6, D41P-6K
• D51 Series: D51EX-22, D51PX-22
• D61 / D65 / D68 Series: D61EX-12, D65EX-16, D65EX-17, D65EX-18, D68ESS-12
• D85 Series: D85EX-15, D85ESS-12

Key Notes

• Serial Number Breaks: Several D31E-18 and D31 series components apply only after specific serial number cutoffs — verify serial before ordering
• Handed Components: Adjuster cylinders, recoil spring covers, and spring assemblies are available in left-hand and right-hand configurations
• Assembly Options: Individual components (pistons, yokes, cylinders, springs, covers) and complete tensioner-recoil spring assemblies are both available
• Seal Kits: Track adjuster seal kits cover D31 and D37 series applications
• Grease Valve: Compatible grease valves span D20 through D85 series dozers

Why Choose Broken Tractor

• ✅ Made in USA options available for D31 and D37 series
• ✅ Wide model coverage from D20 through D85 dozers
• ✅ Fast shipping from Baton Rouge, LA and Kimbolton, OH

Frequently Asked Questions

What Komatsu D31 recoil spring fits a D31E-18 dozer?

It depends on your serial number. Several D31 series and D31E-18 track adjuster parts, including the yoke, recoil spring, spring covers and seal kit, apply only after serial number 25000, and the right-hand adjuster assembly (PV334) lists D31E-18 from serial number 32001. Check your machine's serial number and match the part number before ordering, or call (800) 909-7060 and the parts team can confirm fitment.

Do I need a left-hand or right-hand Komatsu dozer track adjuster?

Many Komatsu D31 and D37 track adjuster parts are handed, so order the side you are replacing. Broken Tractor carries the left-hand adjuster cylinder (113-30-34230) and right-hand cylinder (113-30-34240), the left-hand recoil spring cover (113-30-37110) and right-hand cover (113-30-37120), and left-hand (PV328) and right-hand (PV327) tension adjuster and recoil spring assemblies. The D20P and D21P recoil spring kits also come in left-hand (103-30-34130RSA-L) and right-hand (103-30-34130RSA-R) versions.

Can I buy individual Komatsu track tensioner parts instead of a complete assembly?

Yes, Broken Tractor offers both individual components and complete assemblies. For D31 and D37 series dozers you can buy the track adjuster piston, yoke, cylinder, recoil spring, spring covers and track adjuster seal kit separately, or choose a complete tensioner and recoil spring assembly. Match each part number to your model and serial number so the pieces work together.

Which recoil spring assembly fits Komatsu D41P-6, D51, D61, D68 and D85 dozers?

Broken Tractor carries recoil spring assemblies by model. Part 21K-30-24142RSA fits the D41P-6 and D41P-6K, 124-30-64110RSA fits the D51EX-22 and D51PX-22, and 134-30-63162RSA and RSAA70 fit the D61EX-12 and D68ESS-12. For the D85, 154-30-73130RSA fits the D85EX-15 and 203-30-66250RSA fits the D85ESS-12, while 113-30-34211RSA fits the D31PX-21 and D31PX-22.

Are Komatsu D31 and D37 track adjuster parts available Made in USA?

Yes, Broken Tractor offers Made in USA options for D31 and D37 series dozers, with many parts made by PVE Manufacturing. These include the track adjuster piston, track adjuster yoke, right-hand tension adjustment cylinder and the left-hand and right-hand recoil spring covers. Confirm your model and serial number against each part's fitment before ordering.