690, 690A — Boom Cylinder RE21394 — All Serial Numbers
690B — Boom Cylinder RE21394 — All Serial Numbers
690C — Boom Cylinder RE21394 — After Serial Number 509185
690CR — Boom Cylinder RE21394 — After Serial Number 509185
John Deere Forestry — Track Feller Bunchers:
693B — Boom Cylinder RE21394 — After Serial Number 501445
693C — Boom Cylinder — After Serial Number 509185
Key Notes:
Part Number: RE21395
Weight: 0.40 lbs (181 grams)
Rod Diameter: 2-3/4"
Cylinder: RE21394 (boom cylinder)
Application: Boom cylinder seal kit — seals the hydraulic boom cylinder (RE21394) rod and piston on applicable John Deere 690-series excavators and 693-series track feller bunchers. Restores hydraulic seal integrity to eliminate boom cylinder leaks and restore boom lifting performance
Manufacturer: Hercules Sealing Products — Made in USA
Note: Confirm your machine's serial number before ordering — 690C and 690CR require After Serial Number 509185; 693B requires After Serial Number 501445; 693C requires After Serial Number 509185. The 690 and 690A and 690B apply to all serial numbers
Common Use Case or Symptoms: Use when the boom cylinder is leaking hydraulic fluid from the rod seal area, the boom is drifting or dropping under load, the cylinder wiper seal is cracked or deteriorated, or during a full boom cylinder rebuild — failed boom cylinder seals allow hydraulic fluid to bypass the rod and piston, causing boom drift, loss of lifting capacity, and hydraulic fluid contamination on applicable John Deere 690-series excavators and 693-series track feller bunchers.
Why Choose Broken Tractor:
✅ Made in USA by Hercules Sealing Products: RE21395 is manufactured in the USA by Hercules Sealing Products — a trusted source for hydraulic cylinder seal kits used in heavy equipment applications across John Deere excavators and forestry machines
✅ Serial Number Specific Fitment: Confirm your 690C, 690CR, 693B, or 693C serial number before ordering. 690, 690A, and 690B fit all serial numbers — 690C and 690CR require After Serial Number 509185
✅ Fast Shipping from a U.S.-Based Team: In-stock and ready to ship from our U.S. warehouses
$110.00/ea
Shipping calculated at checkout. If any item in your order is temporarily unavailable, we'll contact you to arrange a back-order or refund — whichever you prefer.
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Do you need your part quickly? You're in luck! We have warehouses all over the country to ensure a quick and easy delivery time. Most of our parts ship from our warehouses the same day you place your order. And many times, orders are delivered in Two to Three days.
Our in house parts are manufactured following strict quality standards in our warehouse in Ohio. Parts such as hydraulic cylinders, pins, bushings, sheet metal, track adjusters, booms and dipper sticks are all ready to ship same day that they are purchased! With less time to wait for your shipment, you will be able to get back to work as quickly as possible.
Did you accidentally purchase the incorrect part? We offer returns and exchanges here at Broken Tractor. To proceed with a return, please call us toll free, and we will provide you with return authorization and a step by step return process for your convenience. We are more than happy to help you exchange your part for the correct one! Give us a call at 1-800-909-7060 and we would be pleased to help you.
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