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Model 645 Fast Attaching Loader - Koyker Manufacturing

Call 1-800-557-4689 to Order

Our customer service team will help place your order with your nearest dealer. Dealership and direct sale pricing may vary. If a dealer is not in your area, please ask us for a freight quote to your location.

Customer Service Hours: Monday - Friday, 8 am to 5 pm CST

785 "Fast Attaching" Loader


Koyker Manufacturing has front end loaders for all major tractor brands, including: John Deere, Kubota, McCormick, New Holland and Case IH. Koyker loaders are designed, engineered and built in the USA. All Koyker loaders come with a 2 year warranty. They are built to handle big loads while the self-storing stands allow for quick mounting and dismounting.

Find the right loader with our Koyker Loader Selector! Click here to access the loader search tool on our main website,

K663578 - 645 Koyker "Fast Attaching" Basic Loader includes bucket level indicator, two 3' bucket cylinders and two 3 1/2" lify cylinders


Item Specs
Bucket Size 7 ft.
Rated Flow 25 GPM
Maximum Pressure 2500 PSI
Lift Cylinder Diameter 3 1/2 in. Bore
Attachment Cylinder Diameter 3 in. Bore
Tractor Horsepower Range 90-200
Maximum Lift Height To Pivot Pin 14 ft. 6 in.
Lift Height Under Level Bucket 13 ft. 8 in.
Clearance With Bucket Fully Dumped 11 ft. 8 in.
Reach At Maximum Lift Height 2 ft. 3 in.
Maximum Dump Angle 45 Degrees
Digging Depth 7 in.
Overall Height In Carry Position 6 ft. 11 in.
Lift Capacity To Maximum Height At Pivot Pin 6780 lbs
Lift Capacity To Maximum Height 31.5" Forward Of Pivot Pin 4830 lbs
Breakout Force At Ground Line At Pivot Pin 7850 lbs
Breakout Force At Ground Line 31.5" Forward Of Pivot Pin 6030 lbs
Raising Time 6 seconds
Lower Time 5 seconds
Attachment Dumping Time 6 seconds
Attachment Rollback Time 4 seconds

We try our best to ship orders in the timeliest manner possible. Each product may have a different level of manufacturing demand and timeframe for shipment.

Shipping Rates

We offer calculated shipping rates during the checkout process. USPS and UPS options are available if the product ordered qualifies for those options.

Order Processing

Business Days: Monday-Thursday.
Holidays, Fridays, Saturdays and Sundays are not included in processing days.

If you have any questions or concerns about your order's status, please email us at to discuss.

International Orders

Customers are responsible for any brokerage fees incurred on shipping. Sioux Steel Company cannot calculate these fees.


Products on this website do not qualify for returns. We understand this may cause you concern....

We are here to help!

Our customer service team is available Monday-Friday, 8am to 5pm CST to discuss the parts in question PRIOR to placing your order.

Call us toll free at 1-800-557-4689 to talk and confirm your parts needed.

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Dealer Locator
We distribute products through local dealerships in your area. Prices and product availability may vary between dealerships.

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NOTE: All product specifications are subject to change or improvement without notice. We reserve the right to change product pricing at any time without further notice. Pricing may differ at the time of purchase.

Contact Sioux Steel by emailing or by calling our customer service specialists at 1-800-557-4689 for additional information.

SIOUX STEEL COMPANY FOUNDATION: 2% of the total sales dollars from this website are donated to the Leukemia and Lymphoma Society in 2021. Beating cancer is in our blood.

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