Track adjusters hold the track at working tension: the grease-charged cylinder and recoil spring assembly that pushes the idler forward, takes up slack and absorbs the shocks the track feeds back when it bites debris. PartsForMachines supplies track adjusters and adjuster components matched by machine make and model, with idlers, rollers, sprockets and the rest of the undercarriage in the same section.
The assembly does two jobs and fails two ways. The tension cylinder, charged with grease through the adjuster valve, sets track sag; leaking seals here mean the track keeps going slack no matter how often it's greased, the classic symptom. The recoil spring behind it cushions impact; a collapsed or broken spring lets the idler slam, throwing tracks and hammering the frame. Adjusters are sold as complete assemblies and as components, seal kits, cylinders, springs and yokes, with each product page listing the machine fitment and dimensions. Compare lines up options, and Ask Simon confirms fitment from the machine model and serial.
A safety note belongs in any adjuster description: the recoil spring is under enormous preload, and adjuster disassembly is a workshop job with the proper fixtures, not a field strip. Relieving track tension safely through the grease valve is routine; opening the spring pack is not.
Track tension itself is the cheapest undercarriage maintenance there is, slack tracks derail, tight tracks wear everything, so the sag specification in the machine manual earns checking weekly. For fitment confirmation, send the machine details via WhatsApp 07754288583.
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Case CX135 SR |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Case CX130B LC |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Case CX145C SR |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX85US |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX60LC-5 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX80SBLC |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX80U |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX60-5 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX70LC-3 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Replaces | Hitachi 9214476 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX70 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX80SB |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX80-5 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX85USB-3 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX70LC |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX75UR-3 (Type 2) |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX75UR |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX75UR-5 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | JCB JZ70 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Replaces | JCB 234/70145 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | JCB 8085 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | JCB 8080 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX75US |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi ZX85USB-5 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Assy |
|---|---|
| Machine | Hitachi EX75US-7 |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Caterpillar 312C L |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Caterpillar 313B |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Caterpillar 313C |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Caterpillar 314C CR |
| Manufacturer | Astrak |
| Part Type | Track Adjuster Spring Group |
|---|---|
| Machine | Caterpillar 314C LCR |
| Manufacturer | Astrak |
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