Gehl 4680 Quick-Tach Pin Removal and Repair Strategy

[MikePhua]

Quick answer
To replace a broken bolt in the manual quick-tach system of a Gehl 4680 skid steer, the sliding pin must be removed by first extracting a retaining element—typically a roll pin or set screw—located within the locking mechanism. Careful disassembly and cleaning are essential to avoid damaging the latch housing or misaligning the coupler.
Gehl 4680 background and quick-tach design
The Gehl 4680 skid steer was part of Gehl’s compact equipment lineup in the late 1990s and early 2000s. Known for its mechanical simplicity and rugged build, the 4680 featured:

• A 46-hp diesel engine
  
• 1,500–1,700 lb rated operating capacity
  
• Manual quick-tach coupler for bucket and attachment changes
  
• Mechanical locking pins operated by levers on each side of the coupler
  

The quick-tach system relies on two sliding pins that engage the attachment’s upper lip. These pins are held in place by bolts and internal retainers, which prevent them from backing out during operation.
Failure scenario and disassembly challenge
In the reported case, one of the bolts securing the quick-tach pin broke, leaving the pin partially engaged and preventing full removal. The operator suspected a retaining element—either a roll pin, set screw, or internal detent—was blocking the pin from sliding out.
This situation is common in older machines where corrosion, dirt, or mechanical wear has seized the pin assembly. Without proper removal, the coupler cannot be repaired or safely used.
Recommended removal procedure
To remove the sliding pin:

• Clean the area thoroughly with degreaser and compressed air
  
• Inspect the pin housing for a small hole or recess—this is where the retaining element is located
  
• Use a punch and hammer to drive out the roll pin or set screw
  
• Apply penetrating oil and allow it to soak for several hours
  
• Tap the pin gently with a brass drift to avoid mushrooming the end
  
• If the pin is still stuck, heat the surrounding metal with a torch to expand the housing slightly
  

Once the pin is removed, replace the broken bolt with a high-grade fastener (Grade 8 or equivalent) and reinstall the retaining element. Always test the coupler with a known attachment before returning to service.
Preventive maintenance and upgrade options

• Grease the quick-tach pins monthly to prevent seizure
  
• Replace roll pins annually or during major service
  
• Consider upgrading to a hydraulic quick-tach system if frequent attachment changes are required
  
• Inspect coupler alignment and weld integrity during each service interval
  

One operator in Iowa retrofitted his Gehl 4680 with a hydraulic quick-tach sourced from a salvage yard. After adapting the hoses and adding a solenoid valve, he could change buckets from the cab—saving 10 minutes per swap and reducing manual strain.
Conclusion
Repairing the manual quick-tach system on a Gehl 4680 requires careful removal of the sliding pin, which is typically retained by a roll pin or set screw. With proper cleaning, lubrication, and mechanical patience, the pin can be extracted and the coupler restored. Preventive maintenance and potential upgrades can extend the life and usability of this essential attachment interface.