The Eaton Fuller K-3728 or K3728 is a Master Rebuild Kit covering the RTX-15710B and RTX-16710B twin-countershaft transmissions. The kit packages over 60 individual components into a single order, including countershaft gears (part nos. 4305052 and 4305657), a main drive gear (4305659), main shaft gear (4305663), multiple snap rings and retaining rings, front bearing cover, sliding clutch, range slave valve assembly, low-range synchronizer assembly, auxiliary direct synchronizer assembly, input shaft assembly, air hoses, filter/regulator assembly, an O-ring kit (K-1450), gasket kit (K-2061), oil seal with slinger (K-2262), and shim kit (K-2805). A genuine Eaton Fuller part, sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
Countershaft gears 4305052 x2 and 4305657 x2
Main drive gear 4305659 x1
Main shaft gear 4305663 x1
3rd and 4th yoke 4305575 x1
Sliding clutch 4306647 x1 and sliding clutch 20323 x1
Input shaft assembly S-1659 x1
Low-range synchronizer assembly A-7254 x1
Aux direct synchronizer assembly A-7331 x1
Range slave valve assembly A-5000 x1
Air filter/regulator assembly A-4740 x1
Front bearing cover 20550 x1
Main case countershaft bearing (front) 4308397 x2
Reverse gear idler shaft bearing 4308403 x2
Clutch release shaft bushings 12815 x4
Magnetic discs 14373 x3
Air hose assemblies 55508 x2 and 55518 x1
O-ring kit K-1450, gasket kit K-2061, oil seal with slinger K-2262, shim kit K-2805
Instruction letter L-2013-02 included
Also referenced as HFK-3728
Features
Fits Eaton Fuller RTX-15710B and RTX-16710B transmissions
Includes countershaft gears, main drive gear, and main shaft gear
Covers bearings: main case countershaft front, reverse idler shaft, and multiple auxiliary positions
Range slave valve assembly and air filter/regulator assembly included
Low-range and auxiliary direct synchronizer assemblies supplied
Sub-kits included: O-ring kit K-1450, gasket kit K-2061, oil seal kit K-2262, and shim kit K-2805
Additional Information
Kit K-3728 Component Highlights (selected items from the full BOM):Countershaft gears 4305052 x2 and 4305657 x2
Main drive gear 4305659 x1
Main shaft gear 4305663 x1
3rd and 4th yoke 4305575 x1
Sliding clutch 4306647 x1 and sliding clutch 20323 x1
Input shaft assembly S-1659 x1
Low-range synchronizer assembly A-7254 x1
Aux direct synchronizer assembly A-7331 x1
Range slave valve assembly A-5000 x1
Air filter/regulator assembly A-4740 x1
Front bearing cover 20550 x1
Main case countershaft bearing (front) 4308397 x2
Reverse gear idler shaft bearing 4308403 x2
Clutch release shaft bushings 12815 x4
Magnetic discs 14373 x3
Air hose assemblies 55508 x2 and 55518 x1
O-ring kit K-1450, gasket kit K-2061, oil seal with slinger K-2262, shim kit K-2805
Instruction letter L-2013-02 included
Also referenced as HFK-3728
