: Once positioned, tighten the clamp bolt. For many thumb-tap models, this is roughly 4 Nm. Avoid overtightening, as it can damage the handlebar or shifter body. 3. Routing the Shift Cable
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These require welding a base plate directly to the dipper stick. They are universal and often more affordable but require permanent modification.
The thumb lever must move forward for downshifts (instinctive thumb push) and backward for upshifts, or vice versa. Test ergonomics before tightening. xxx trany thumbs install
Ensure the thumb tines mesh perfectly with the teeth of your specific bucket without binding or colliding. Step 4: Final Structural Welding
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Once clearance and alignment are 100% verified, remove the hydraulic cylinder from the brackets to protect its internal rubber seals and chrome rod from heat distortion and welding spatter. : Once positioned, tighten the clamp bolt
Loosen and remove the nuts securing the old transmission mounts to the transmission casing and the crossmember brace. Once the mount nuts are removed, loosen the heavy bolts holding the crossmember brace to the vehicle's chassis frame. Carefully lower the crossmember out of the way. With the crossmember removed, slide out the old, worn mounts.
: Tighten all fasteners to the manufacturer’s specific torque settings to prevent vibration or failure.
Before installation, identify which mounting style your machine requires: The thumb lever must move forward for downshifts
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Mount the hydraulic cylinder between the thumb chassis and the upper stick bracket.
[Engine Block] ➔ [Block Plate] ➔ [Flywheel (80 ft-lbs)] ➔ [Clutch Disc] ➔ [Pressure Plate (35 ft-lbs)] ➔ [Transmission Input Shaft] Phase 2: Mechanical Thumb Bracket Fitment
: It is critical to set your thumb's hydraulic pressure (often max 2,500 PSI ) so it doesn't overpower the bucket and cause structural damage. Top Brands & Resources