Part of the Kubota Parts Manuals.
This is the Kubota TL420 (B20) parts catalog, a 35 page illustrated PDF for the TL420 loader fitted to the B20. It pairs exploded diagrams with reference numbers, Kubota part numbers, quantities, and serial number ranges, so you can identify the exact part before ordering.Coverage spans the loader frame and hydraulics: the side frame and boom, the control valve and new type control valve, the lever, control lever, and control cover, the link, the cylinder and hydraulic hose group, the boom and bucket cylinder component parts, the hydraulic tube, and the delivery and return tube.Use it to trace a weak or slow loader circuit, match a leaking fitting or hose to its part number, order a cylinder seal kit for the boom or bucket rams, or rebuild the control valve. The interchangeability legend and serial ranges in the parts lists help you order the correct revision for your machine.
What's Inside This Kubota TL420(B20) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Side Frame | 4-5 | Side LH Frame, Model Label, Caution Label, Side RH Frame, Side Frame Connector, Hex.bolt, Hex.nut, Brace LH |
| Boom | 6-7 | Grease Fitting, Kubota Label, Link, Bucket, Cutting Edge, Leveler Label, TL420 Label |
| Control Valve | 8-9 | Valve Stay, Hex.bolt, Control Refer to L.no. 0G03-L0 Valve, Control Refer to L.no. 0G03-R0 Valve, Hex.nut, Assy Adapter, Assy Elbow |
| Control Valve (New Type) [Component Parts] | 10-11 | Control Valve, Assy Inlet Section, Inlet Housing, Assy Spool Section, Clevis End, Spool Spacer-Cap, Plate-Seal, Cap Screw-soc.hd |
| Lever | 12-13 | Bushing, Rod, Washer |
| Control Lever | 14-15 | Lever Grip, Rod End Joint, Collar, Rod |
| Control Cover | 16-17 | Cover, Hex.bolt, Control Label, Assy Limiter, Rubber Cushion |
| Link | 18-19 | Bushing, Rod, Connecting Rod |
| Cylinder/Hydraulic Hose | 20-21 | Cylinder LH Refer to L.no. 0G06-R0 for, Cylinder RH Refer to L.no. 0G07-L0 for, Elbow, Long Elbow, White Mark, Mark.yellow, Blue Mark, Red Mark |
| Cylinder (Boom) LH [Component Parts] | 22-23 | Boom Cylinder LH, Tube Comp LH, Rod Comp, Head, Piston, Seal Kit, Grease Fitting |
| Cylinder (Boom) RH [Component Parts] | 24-25 | Boom Cylinder RH, Tube Comp RH, Rod Comp, Head, Piston, Seal Kit, Grease Fitting |
| Cylinder (Bucket) LH [Component Parts] | 26-27 | Bucket Cylinder LH, Tube Comp LH, Rod Comp, Head, Piston, Seal Kit, Grease Fitting |
| Cylinder (Bucket) RH [Component Parts] | 28-29 | Bucket Cylinder RH, Tube Comp RH, Rod Comp, Head, Piston, Seal Kit, Grease Fitting |
| Hydraulic Tube | 30-31 | Hex.bolt, Clamp, Washer |
| Delivery/Return Tube | 32-34 | Delivery Tube, Return Tube, Joint, Gasket, Hex.bolt, Hydraulic Hose, Green Mark, Orange Mark |
| Accessories and Service Parts | 35 | Operator S Manual, Kit French, Caution French Label, Warning French Label, Leveler French Label, Control French Label, Lubricate French Label, Operator S Manual French |
Kubota TL420(B20) Common Problems This Manual Covers
Loader arm weak, slow, or intermittent
When the boom moves slowly or intermittently, the fault is often a worn control valve spool or a low pressure circuit. The control valve breakdown identifies the valve, adapters, and mounting so you can inspect the spools.
Manual Section: Control Valve p. 8Loader control issues with good spool travel
Control problems can persist even when the spools and linkage move correctly, pointing deeper into the valve. The new type control valve component parts list shows the inlet and spool sections, caps, and O-rings for a rebuild.
Manual Section: Control Valve (New Type) [Component Parts] p. 10Hydraulic fluid foams or pushes out the rear
Foamy overflow or fluid pushing out the back usually follows a failed fitting or a suction side air leak. The delivery and return tube section identifies the tubes, joints, gaskets, and clamps to check for leaks.
Manual Section: Delivery/Return Tube p. 32Weak lift from an internal cylinder leak
A boom that drifts or lifts weakly often means internal cylinder leakage past the piston seals. The boom cylinder component parts section lists the tube, rod, head, piston, and seal kit for a rebuild.
Manual Section: Cylinder (Boom) Lh [Component Parts] p. 22Hose or fitting leaks at the loader
External leaks commonly start at a hose or elbow on the cylinder circuit. The cylinder and hydraulic hose section shows the cylinders, elbows, clamps, and hoses so you can match the leaking part.
Manual Section: Cylinder/Hydraulic Hose p. 20Worn boom pins and bushings
Play in the loader arm often traces to worn pins, bushings, or clips at the boom pivots. The boom section identifies the assy pins, cir-clips, and grease fittings so you can renew the worn joints.
Manual Section: Boom p. 6Frequently Asked Questions
Which machine does this catalog cover?
It covers the Kubota TL420 loader as fitted to the B20. Every diagram and parts list is specific to the TL420 (B20), with serial number ranges shown so you can confirm fitment for your loader.
Does it cover the loader control valve?
Yes. It includes both the Control Valve section and a new type control valve component parts breakdown with the inlet and spool sections, caps, and O-rings, so you can inspect or rebuild the valve. p. 8
Can I order cylinder seal kits from it?
Yes. The boom and bucket cylinder component parts sections list the tube, rod, head, piston, and seal kit for each ram, so you can source the correct seal kit by part number. p. 22
Is this a repair manual or a parts catalog?
It is a parts catalog. It provides exploded diagrams, reference numbers, Kubota part numbers, quantities, and serial ranges for ordering parts, rather than step by step repair procedures.
Is this Kubota TL420(B20) Parts Catalog a digital download?
Immediate download of the complete 35-page searchable Parts Catalog. Access it on any device: the laptop at your desk or your phone in the field.
Can I print specific sections of this Kubota TL420(B20) Parts Catalog?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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