Hustler 781302 Idler Spring | OEM Mower Belt Tension Spring

Hustler 781302 Idler Spring | OEM Mower Belt Tension Spring

Product Number: 781302

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Product Brand: Hustler Parts
Product Type: Parts

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Hustler 781302 OEM Idler Spring

The Hustler 781302 Idler Spring is a genuine OEM Hustler replacement spring used on select Hustler mower belt, deck, and idler tensioner applications. This part is commonly searched as an idler spring, belt tension spring, deck spring, tensioner spring, or mower idler pulley spring.

The idler spring helps maintain proper belt tension where specified by the Hustler parts diagram. A worn, stretched, broken, weak, or missing spring can cause belt slipping, poor blade engagement, belt jumping, belt squeal, uneven cutting, or premature belt and pulley wear.

Always verify your full Hustler model number, serial number, original spring part number, belt routing, idler arm location, spring mounting points, and parts diagram before ordering. Do not order by mower series or deck size alone.

Product Details

Brand Hustler
Part Number 781302
Product Type Idler Spring / Belt Tension Spring
Common Names Idler spring, deck belt spring, belt tensioner spring, idler pulley spring, mower spring
System Area Deck Belt / Drive Belt / Idler Tensioner Assembly where specified
Compatible Series Select Hustler Z, Mini Z, Super Mini Z, FasTrak, FasTrak SD, Sport, Diesel Z, ATZ, X-ONE, Super Z, HyperDrive, Super S, Super SF, Super 104, Super 88, X-RIDE, and related models where specified
OEM / Aftermarket Genuine OEM Hustler replacement part

Compatible Hustler Model References

This is a where-used reference list. Hustler 781302 is listed across many Hustler parts manual references, including these main mower families:

  • Hustler Z and XR-7 Z
  • Hustler Mini Z and Super Mini Z
  • Hustler FasTrak and FasTrak SD
  • Hustler Sport and Z4
  • Hustler Diesel Z
  • Hustler ATZ and XR-7 ATZ
  • Hustler X-ONE and X-ONEi
  • Hustler Super Z and Super Z XR-7
  • Hustler Super Z HyperDrive
  • Hustler Super S
  • Hustler Super SF
  • Hustler Super 88 and Super 104
  • Hustler X-RIDE
  • BigDog C Series applications where specified
Older Hustler Z / Mini Z / FasTrak / ATZ References
  • Hustler Z XR-7 Parts Manual - S/N prior to 07020000
  • Hustler Z Parts Manual - S/N higher than 07020000
  • Hustler Z Parts Manual
  • Hustler Super Z XR-7 Parts Manual, 2005-2007
  • XR-7 Super Z Parts Manual - prior to S/N 1011
  • Hustler Mini Z 36" / 42" Parts Manual - S/N prior to 07020000
  • Mini Z & FasTrak SD 36" / 42" Parts Manual - S/N 07020000 and higher
  • Hustler Mini Z 44" / 52" Parts Manual
  • Mini Z 44" / 52" Parts Manual
  • Hustler Super Mini Z 44" / 52" Parts Manual
  • Super Mini Z HT 52" Parts Manual
  • Hustler FasTrak 44" / 52" Parts Manual - produced prior to S/N 1011
  • FasTrak 48" / 54" Parts Manual - produced prior to S/N 1011
  • Hustler FasTrak 48" / 54" / 60" Parts Manual - produced after S/N 1011
  • Hustler FasTrak SD 48" / 54" / 60" Parts Manual
  • Hustler FasTrak SD 48" / 54" / 60" Parts Manual - produced after S/N 1011
  • Hustler XR-7 ATZ Parts Manual
  • Hustler ATZ Parts Manual
  • ATZ Parts Manual
Super Z / Super Z HyperDrive References
  • Hustler Super Z Parts Manual - produced after S/N 1011
  • Hustler Super Z Parts Manual - produced after S/N 1210
  • Hustler Super Z Parts Manual, 2016
  • Hustler Super Z EX Parts Manual, 2016
  • Hustler Super Z HyperDrive Parts Manual
  • Hustler Super Z HyperDrive EX Parts Manual
  • 54" Super Z - 936872 - HTHSZS054KAWFX850VA
  • 60" Super Z - 936880 - HTHSZS060KAWFX850VA
  • 72" Super Z - 936930 - HTHSZS072KAWFX1000VA
  • 60" Super Z - 936989 - HTHSZS060KAWFX1000VA
  • 60" Super Z - 937714 - HTHSZS060KAWFX1000VA
  • 66" Super Z - 937722 - HTHSZS066KAWFX1000VA
  • 66" Super Z - 937730 - HTHSZS066KAWFX1000VA
  • 60" Super Z - 941146 - HTHSZS060KAWFX850VA
  • 60" Super Z - 941153 - HTHSZS060KAWFX1000VA
  • 66" Super Z - 941179 - HTHSZS066KAWFX1000VA
  • 72" Super Z - 941187 - HTHSZS072KAWFX1000VA
  • 60" RD Super Z - 941195 - HTHSZR060KAWFX850VA
  • 72" RD Super Z - 941203 - HTHSZR072KAWFX850VA
  • 60" Super Z HyperDrive - 936997 - HTSHDS060BASVANM61A
  • 60" Super Z HyperDrive - 937003 - HTSHDS060BASVANM61EFIA
  • 72" Super Z HyperDrive - 937037 - HTSHDS072BASVANM61EFIA
  • 60" Super Z HyperDrive - 941229 - HTSHDS060BASVANM61A
  • 60" Super Z HyperDrive - 941237 - HTSHDS060BASVANM61EFIA
  • 60" RD Super Z HyperDrive - 941245 - HTSHDR060BASVANM61EFIA
  • 60" Super Z HyperDrive - 941310 - HTSHDS060KAWFX1000V
  • 60" Super Z HyperDrive - 941534 - HTSHDS060KAWFX1000VEFIA
  • 72" Super Z HyperDrive - 941542 - HTSHDS072KAWFX1000VEFIA
  • 60" RD Super Z HyperDrive - 941559 - HTSHDR060KAWFX1000VA
  • 60" Super Z HyperDrive - 943969 - HTSHDV060KAWFX1000VA
  • 72" Super Z HyperDrive - 943993 - HTSHDV072KAWFX1000VA
X-ONE / X-ONEi References
  • Hustler X-ONE Parts Manual
  • Hustler X-ONE Parts Manual, Export
  • Hustler X-ONEi Parts Manual
  • 52" X-ONE - 936237 - HTX1TS052KAWFX850VA
  • 60" X-ONE - 936278 - HTX1TS060KAWFX730VA
  • 60" X-ONE - 936286 - HTX1TS060KAWFX850VA
  • 72" X-ONE - 936328 - HTX1TS072KAWFX850VA
  • 52" X-ONE - 940056 - HTX1TS052KAWFX850VA
  • 60" X-ONE - 940064 - HTX1TS060KAWFX730VA
  • 60" X-ONE - 940072 - HTX1TS060KAWFX850VA
  • 72" X-ONE - 940106 - HTX1TS072KAWFX850VA
  • 60" X-ONE - 942201 - HTX1TS060KAWFT730VA
  • 60" X-ONE w/Tweels - 942334 - HTX1TS060KAWFX850VA
  • 52" X-ONE - 941831 - HTXHGX052KAWFX850VA
  • 60" X-ONE - 941856 - HTXHGX060KAWFX850VA
  • 72" X-ONE - 941872 - HTXHGX072KAWFX850VA
  • 60" X-ONE - 943795 - HTXHGX060KAWFX850VA
  • 72" X-ONE - 943811 - HTXHGX072KAWFX850VA
Diesel Z / Out-Front Deck References
  • 60" & 72" Out-Front Deck Parts Manual
  • Hustler Diesel Z Parts Manual - produced prior to S/N 1110
  • Hustler Diesel Z Parts Manual - prior to S/N 1110
  • Diesel Z Parts Manual
  • 60" Diesel Z - 938233US - HTHDZS060SHIS773LFU
  • 60" RD Diesel Z - 938241US - HTHDZR060SHIS773LFU
  • 72" Diesel Z - 938258US - HTHDZS072SHIS773LFU
  • 72" RD Diesel Z - 938266US - HTHDZR072SHIS773LFU
  • 60" Diesel Z - 940452US - HTHDZS060PER403J-11U
  • 60" RD Diesel Z - 940460US - HTHDZR060PER403J-11U
  • 72" Diesel Z - 940478US - HTHDZS072PER403J-11U
  • 72" RD Diesel Z - 940486US - HTHDZR072PER403J-11U
  • 60" Diesel Z - 943233US - HTHDZV060PER403J-11U
  • 60" Rear Discharge Diesel Z - 943241US - HTHDZR060PER403J-11U
  • 72" Diesel Z - 943249US - HTHDZV072PER403J-11U
  • 72" Diesel Z - 943266US - HTHDZR072PER403J-11U
Super S / Super SF / Super 104 / Super 88 References
  • 36" Super S - 933325 - HTSUPS036KAWFS541VA
  • 48" Super S - 933333 - HTSUPS048KAWFX691VA
  • 52" Super S - 933341 - HTSUPS052KAWFX691VA
  • 60" Super S - 933358 - HTSUPS060KAWFX730VA
  • 36" Super S - 937128 - HTSUPS036KAWFS541VA
  • 48" Super S - 937136 - HTSUPS048KAWFX691VA
  • 52" Super S - 937144 - HTSUPS052KAWFX691VA
  • 60" Super S - 937151 - HTSUPS060KAWFX730VA
  • 36" Super S - 940205 - HTSUPS036KAWFS541VA
  • 48" Super S - 940213 - HTSUPS048KAWFX691VA
  • 52" Super S - 940221 - HTSUPS052KAWFX691VA
  • 60" Super S - 940304 - HTSUPS060KAWFX850VA
  • 60" Super SF - 942029 - HTSULS060KAWFX1000EFIVA
  • 72" Super SF - 942037 - HTSULS072KAWFX1000EFIVA
  • 60" Super SF - 943506 - HTSULS060KAWFX1000VEFIA
  • 72" Super SF - 943514 - HTSULS072KAWFX1000VEFIA
  • Super 104 Parts Manual
  • Super 104 Parts Manual, Export
  • Super 104 - 939462 - HTSWSR104BASVANM61A
  • Super 104 - 941526 - HTSWSR104KAWFX1000VEFIA
  • Super 104 - 943217 - HTSWSR104KAWFX1000VEFIA
  • Super 88 - 936617 - HTSUWR088BASVANM61A
  • Super 88 - 939546 - HTSUWR088BASVANM61EOGA
FasTrak / FasTrak SD / FasTrak SDX / Sport / Z4 References
  • Hustler Sport Parts Manual - produced prior to S/N 1011
  • Hustler Sport Parts Manual - produced after S/N 1011
  • Hustler Z4 Parts Manual
  • 48" FasTrak - 941724 - HTFSTS048KAWFT691VA
  • 54" FasTrak - 941732 - HTFSTS054KAWFT691VA
  • 60" FasTrak - 941740 - HTFSTS060KAWFT730VA
  • 48" RD FasTrak - 941757 - HTFSTR048KAWFT691VA
  • 54" RD FasTrak - 941765 - HTFSTR054KAWFT691VA
  • 48" FasTrak SDX - 941674 - HTFSXS048KAWFX691VA
  • 54" FasTrak SDX - 941682 - HTFSXS054KAWFX691VA
  • 60" FasTrak SDX - 941708 - HTFSXS060KAWFX730VA
  • 48" FasTrak - 943704 - HTFSTS048KAWFT691VA
  • 48" FasTrak SDX - 943753 - HTFSXS048KAWFX691VA
  • 54" FasTrak SDX - 943761 - HTFSXS054KAWFX691VA

Important: This is a where-used reference list. Always confirm your exact Hustler model number, serial number, spring location, idler arm setup, belt routing, mounting points, and parts manual list 781302 before ordering.

Key Features

  • Genuine OEM Hustler idler spring
  • Replacement part number 781302
  • Used on select Hustler belt, deck, and idler tensioner applications
  • Helps maintain proper belt tension where specified
  • Commonly searched as a belt tension spring, idler pulley spring, deck spring, or mower idler spring
  • Factory-correct replacement when listed in your Hustler parts manual

Why Choose an OEM Hustler Idler Spring?

An idler spring must match the correct spring length, hook style, tension rate, idler arm location, and belt system. Using the wrong spring can cause poor belt tension, belt slippage, belt jumping, idler arm misalignment, or premature belt and pulley wear.

Genuine Hustler OEM springs are designed to match the original belt tension requirements of compatible Hustler mower applications. When your parts manual lists 781302, this OEM idler spring is the correct replacement for that application.

  • Correct OEM fit when specified by Hustler
  • Designed for compatible Hustler idler arm and belt tensioner systems
  • Helps restore proper belt tension
  • Helps reduce belt slip, belt noise, and belt wear
  • Reduces guesswork compared to universal replacement springs

When to Replace an Idler Spring

Replace or inspect the idler spring if it is stretched, weak, broken, rusted, missing, or no longer holds the idler arm in the correct position.

  • Belt slips, squeals, or jumps off
  • Idler arm does not maintain proper tension
  • Spring is stretched, rusty, weak, or broken
  • Spring hooks are worn or damaged
  • Deck belt or drive belt wears faster than normal
  • Idler pulley chatters or does not track correctly
  • Parts manual lists Hustler 781302 for your mower

Important Fitment Notes

  • This is an OEM Hustler idler spring
  • Fits select Hustler belt and idler tensioner applications where specified
  • Verify your model and serial number before ordering
  • Confirm spring location, belt routing, idler arm setup, spring hook orientation, and mounting points
  • Do not order by mower series or deck size alone
  • Inspect the belt, idler pulley, idler arm pivot, spring anchor points, deck pulleys, and related hardware during replacement

Pre-Purchase Checklist

Before ordering Hustler 781302, confirm:

  • Your full Hustler model number
  • Your mower serial number
  • Your original idler spring part number
  • Your parts manual lists 781302
  • Your spring location matches the parts diagram
  • Your idler arm, pulley, belt routing, and spring anchor points match the original setup
  • Your belt and pulley system are in serviceable condition

Installation and Service Notes

Idler spring replacement should be performed with the mower parked on level ground, key removed, parking brake engaged, blades disengaged, and all moving parts stopped. Belt tension springs can be under load, so remove and install carefully.

  • Take a photo of the original spring location and belt routing before removal
  • Use caution when removing a spring under tension
  • Inspect the idler pulley, idler arm, pivot bushing, spring anchor points, and belt condition
  • Install the spring in the same orientation shown in the parts diagram
  • Verify the idler arm moves freely and returns with proper tension
  • Confirm the belt is routed correctly before operation
  • Run the mower carefully and check for belt tracking, belt noise, or idler chatter

Part Number / Search Terms

Hustler 781302 may also be searched as:

  • Hustler 781302
  • 781302 idler spring
  • Hustler idler spring 781302
  • Hustler mower idler spring
  • Hustler belt tension spring
  • Hustler deck belt spring
  • Hustler tensioner spring
  • Hustler idler pulley spring
  • Hustler Super Z idler spring
  • Hustler HyperDrive idler spring
  • Hustler X-ONE idler spring
  • Hustler Diesel Z idler spring
  • Hustler FasTrak idler spring
  • Hustler Super S idler spring
  • Hustler Super 104 idler spring
  • Hustler OEM spring

Frequently Asked Questions

What is Hustler 781302?

Hustler 781302 is a genuine OEM idler spring used on select Hustler mower belt, deck, and idler tensioner applications.

What does an idler spring do?

An idler spring helps keep tension on an idler arm or belt tensioner so the mower belt stays properly tensioned and tracks correctly.

What models does Hustler 781302 fit?

This idler spring is listed across many Hustler parts manuals, including select Hustler Z, Mini Z, FasTrak, Diesel Z, ATZ, X-ONE, Super Z, Super Z HyperDrive, Super S, Super SF, Super 104, Super 88, and related models. Always verify your exact model and serial number before ordering.

How do I know if this idler spring fits my mower?

Match your mower model number, serial number, original spring part number, belt routing, spring mounting location, idler arm setup, and Hustler parts manual to part number 781302.

Should I inspect the belt and idler pulley too?

Yes. Inspect the belt, idler pulley, idler arm pivot, spring anchor points, deck pulleys, and related hardware during idler spring replacement.

Is this an OEM Hustler part?

Yes. This listing is for a genuine OEM Hustler replacement idler spring.

P&P Small Engines stocks genuine Hustler mower parts, idler springs, deck belt springs, belts, pulleys, idlers, spindle assemblies, caster wheels, brake parts, filters, oils, blades, and OEM replacement parts for commercial and residential outdoor power equipment.

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