Winch Clutch Piston for John Deere 4000 Series Winch, Dozers & Skidders – R81735

Fits Models At A Glance:

• John Deere Crawler Dozers (J Series): 450J, 550J, 650J — Serial Number 159987 and Up; 700J — Serial Number 139436 and Up
• John Deere Crawler Dozers (K Series): 450K — Serial Number 304771 and Up; 550K, 650K, 700K
• John Deere Crawler Dozers (L & P Series): 700L — Serial Number 383562 and Up; 450P, 550P, 650P — Serial Number 01837 and Up; 700P — Serial Number 11340 and Up
• John Deere Crawler Dozers: 714PR

• John Deere Forestry – D Series Skidders: 360D, 460D, 560D, 660D
• John Deere Forestry – E Series Skidders: 540E, 640E, 740E, 548E, 648E, 748E
• John Deere Forestry – G Series Skidders: 540G — Before Serial Number 624870; 548G — Before Serial Number 578013; 640G — Before Serial Number 612567; 648G — Before Serial Number 612635; 740G, 748G, 848G
• John Deere Forestry – G-II Series Skidders: 540G-II, 548G-II, 640G-II, 648G-II, 748G-II
• John Deere Forestry – G-III Series Skidders: 540G-III, 548G-III, 640G-III, 648G-III, 748G-III
• John Deere Forestry – H Series Skidders: 540H, 548H, 640H, 648H, 748H, 848H, 648HTJ, 748HTJ, 848HTJ
• John Deere Forestry – L Series Skidders: 640L, 648L, 748L, 848L, 948L, 640L-II, 648L-II, 748L-II, 848L-II, 948L-II, 640L-III, 648L-III, 748L-III, 848L-III, 948L-III
• John Deere Forestry – Bogie Skidders: 768L-II, 768L-III

Key Notes:

• Part Numbers: R81735
• Type: Winch clutch piston
• Winch Compatibility: John Deere 4000 Series winch (Models 40, 4000 and 4000S)
• Weight: 1.30 lbs (0.59 kg)
• Serial Number Notes: On the J, K, L and P Series dozers, fits machines from the serial numbers shown above. On the 540G, 548G, 640G and 648G, fits machines built before the serial numbers shown above. All other models listed fit every serial number.
• Companion Part: The sealing piston ring for this clutch piston is R33248
• Related Parts: Winch clutch input shaft bearing AT139681, side cover O-ring T51625, free spool internal oil seal AT173348
• Application: Hydraulic piston inside the John Deere 4000 Series winch clutch. Oil pressure moves the piston to clamp the clutch pack and engage the winch.
• Condition: Replacement Part for John Deere Equipment

Common Use Case or Symptoms: Use when the winch clutch slips, engages slowly, or won't hold under load, or when the piston's ring groove or bore face is worn or scored — a damaged piston can't hold clutch pressure even with new seals.

Why Choose Broken Tractor:

• ✅ Clutch Piston for the 4000 Series Winch – restores full clutch clamping force
• ✅ Order With the R33248 Sealing Ring – piston and seal together for a complete clutch repair
• ✅ Fast Shipping from a U.S.-Based Team – ready to ship from our U.S. warehouses