Kubota Boom swing bracket casting
This is a Kubota K7902 hydraulic thumb kit for the KX121 mini excavator. It includes a welded thumb assembly listed for the KX71/91/121-3 and U35, a hydraulic cylinder (P/N 70091-00096) with bushings already installed, and 1.233 in pivot pins. It comes with a locking arm, hydraulic fittings, grease zerks and a cylinder seal kit. Note: the listing's model field says "Boom swing bracket casting." That part is not in this kit, so check with the seller exactly what comes with the item.
What a used Kubota Boom swing bracket casting sells for
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Kubota Boom swing bracket casting specs
TypeHydraulic thumb kit (KX121)
Part NumberK7902
Grease Zerks1/8 in NPT on cylinder and welded assembly
InstructionsThumb kit instruction manual, P/N 70091-00119
Rod End Fitting8MJ-8FJX90
External CirclipP/N 04612-00400
Other ComponentsLocking arm, cylinder seal kit
Cylinder Bushings77700-01857 (2 pcs)
Cylinder Mount Pin1.233 in x 3 3/4 in long, P/N 70091-00107
Dipper Arm Fitting8MP-8MJ, P/N 70091-00098
Hydraulic CylinderWith RBC bushings installed, P/N 70091-00096
Retaining Roll Pin5/16 in
Cylinder-to-Thumb Pin1.233 in x 8 3/4 in long
Thumb Welded AssemblyKX71/91/121-3 & U35, P/N 70091-00104
Cylinder Service Port Fitting10MB-8MJ
From the Kubota Boom swing bracket casting spec sheet (Kubota Tractor K7902 HYD THUMB KIT(KX121) I00100 K7902 Thumb Kit ↗), same series as the exact model. Check the nameplate on the unit.
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