Description
The Ferris 5105068YP spring is a genuine OEM replacement spring used on select mower deck pulley, belt, and idler arm assemblies. This spring is also listed as STIHL WB05 764 1615 and is commonly used in compatible deck drive and idler systems.
This spring is designed to help maintain proper belt tension and idler arm operation on compatible mower decks. A worn, stretched, broken, or missing spring can cause belt slipping, poor blade engagement, deck vibration, uneven cutting, or premature belt wear.
This spring measures approximately 1.22″ outside diameter, 10.5″ free length, and .192″ wire diameter. Fitment depends on the exact mower model, deck size, and pulley / belt / idler arm assembly, so always verify your model and original part number before ordering.
Ferris 5105068YP Spring Specs
Brand: Ferris / STIHL
Ferris Part Number: 5105068YP
STIHL Part Number: WB05 764 1615
Product Type: Spring
: Extension Spring
Outside Diameter: 1.22″
Free Length: 10.5″
Wire Diameter: .192″
Color / Finish: Black
Application: Mower deck pulley, belt, and idler arm system
OEM / Aftermarket: Genuine OEM
Replaces / Cross-References
This spring may be searched as:
Ferris 5105068YP
5105068YP
STIHL WB05 764 1615
WB05 764 1615
WB057641615
Ferris deck spring
STIHL deck spring
mower deck idler spring
mower belt tension spring
extension spring 1.22 OD 10.5 FL .192 wire
STIHL RZ Fitment
STIHL WB05 764 1615 / Ferris 5105068YP is commonly used on select STIHL RZ mower deck pulley, belt, and idler arm assemblies, including:
RZ 552.0
52″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 552.0 K
52″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 560.0
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 560.0 K
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 752.0 K
52″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 752.0i
52″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 752.0i K
52″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 760.0 K
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 760.0i
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 760.0i K
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 960.0 K
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 960.0i
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 960.0i K
60″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 972.0 K
72″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 972.0i
72″ Mower Deck – Pulleys, Belts & Idler Arms
RZ 972.0i K
72″ Mower Deck – Pulleys, Belts & Idler Arms
Common Ferris Fitment
Ferris 5105068YP is commonly associated with select Ferris mower deck pulley, belt, and idler arm assemblies, including:
IS2100Z Series
IS3200Z Series
ISX800 Series
ISX2200 Series
ISX3300 Series
IS6200 Series
F210Z Series
F320Z Series
Common deck groups include:
52″ Mower Deck Group – Pulleys, Belts & Idler Arms
60″ iCD+ Mower Deck Group – Pulleys, Belts & Idler Arm
61″ Mower Deck Group – Pulleys, Belts & Idler Arms
72″ Mower Deck Group – Pulleys, Belts & Idler Arms
Features
Genuine OEM replacement spring
Ferris part number 5105068YP
Also listed as STIHL WB05 764 1615
Extension spring design
Used on select mower deck pulley, belt, and idler arm assemblies
Helps maintain proper deck belt tension
Helps support correct idler arm operation
Designed for compatible Ferris and STIHL mower applications
Built to OEM fit and function specifications
When Should You Replace a Deck Spring?
Replace your mower deck spring if it is stretched, broken, rusted, missing, weak, or no longer keeping proper belt tension. Common signs of a failing deck spring include belt slipping, belt jumping off pulleys, poor blade engagement, deck noise, vibration, or uneven cutting.
Using the correct OEM spring helps maintain proper belt tension and deck drive performance.
Important Fitment Note
Ferris 5105068YP / STIHL WB05 764 1615 fits select mower deck pulley, belt, and idler arm assemblies, but fitment can vary by mower model, deck size, serial number, and belt system.
Before ordering, confirm:
Your mower model number
Your mower serial number
Your deck size
Your original spring part number
Whether your machine uses Ferris 5105068YP or STIHL WB05 764 1615
Frequently Asked Questions
Is Ferris 5105068YP an OEM part?
Yes. Ferris 5105068YP is a genuine OEM replacement spring for compatible mower deck applications.
Is STIHL WB05 764 1615 the same spring?
This spring is also listed as STIHL WB05 764 1615. Always verify fitment by model and original part number before ordering.
What is this spring used for?
This spring is commonly used in mower deck pulley, belt, and idler arm assemblies to help maintain proper belt tension.
What are the spring dimensions?
The listed dimensions are approximately 1.22″ outside diameter, 10.5″ free length, and .192″ wire diameter.
Does this fit STIHL RZ mowers?
Yes, it is commonly listed for select STIHL RZ 52″, 60″, and 72″ mower deck pulley, belt, and idler arm assemblies.
Does this fit Ferris mowers?
Yes, it is commonly associated with select Ferris mower deck pulley, belt, and idler arm assemblies. Fitment depends on exact model, deck size, and serial number.
How do I know if my deck spring is bad?
Common signs include a stretched or broken spring, loose belt tension, belt slipping, belt jumping off pulleys, deck vibration, or poor blade engagement.
Should I verify fitment before ordering?
Yes. Always verify your mower model, serial number, deck size, and original part number before ordering.
P&P Small Engines stocks genuine Ferris and STIHL replacement parts to help keep mower decks, belts, pulleys, and idler systems working properly.
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