This Kubota L1720 Parts Catalog is the factory illustrated parts reference for the L1720 tractor loader, serial prefix 51604. It lays out the loader's hydraulic system as exploded diagrams paired with Kubota part numbers, quantities, and interchangeability notes, so you can identify the exact component before you order.Coverage centers on the front-end loader hydraulics: hydraulic tubes and hose assemblies, the 2 spool control valve and its decal and hoses, the tractor hydraulic kit, muffler relocator, the external hydraulic kit with front mounted pump and oil filter, lift and attachment cylinders, and the hydraulic pump.Use it to cross-check hose lengths and fittings, confirm a superseded part, or build an accurate order for a leak repair or cylinder rebuild without guesswork.
What's Inside This Kubota L1720 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Bucket Level Indicator | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Main Frame/Sub-Frames/Mounting Brackets | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Hydraulic Tubes and Hose Assemblies | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Spool Control Valve Decal and Hoses | - | 2 Spool Control Valve Decal and Hoses, Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Tractor Hydraulic Kit | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Muffler Relocator | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| External Hydraulic Kit Front Mounted Pump Oil Filter | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Lift Cylinder | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Attachment Cylinder | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Spool Control Valve | - | 2 Spool Control Valve, Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
| Hydraulic Pump | - | Interchangeable, Not Interchangeable Ni, New for Old, Old for New |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| HOSE length | 26 inches | p. 6 |
| HOSE diameter | 1/2 inch | p. 6 |
| FITTING 90 O-RING angle | 90 degrees | p. 6 |
| FITTING angle | 90 degrees | p. 9 |
Kubota L1720 Common Problems This Manual Covers
Loader lifts slowly or stalls
Weak or slow bucket and arm movement on the L1720 often traces to the loader hydraulic circuit, low fluid, or a tired pump. This catalog identifies the hydraulic pump assembly and its parts for inspection or replacement.
Manual Section: Hydraulic Pump p. 20Leaks at hoses and fittings
Hydraulic oil weeping from loader lines usually means a worn hose, a loose fitting, or a failed O-ring fitting. The hose and tube diagrams list each line with its size and part number.
Manual Section: Hydraulic Tubes And Hose Assemblies p. 5Lift cylinder drifts or leaks
A lift cylinder that will not hold the load or seeps oil past the seals points to worn cylinder components. This section breaks down the lift cylinder for a seal kit or rebuild.
Manual Section: Lift Cylinder p. 14Bucket cylinder creeps
An attachment cylinder that drifts down under load or leaks at the rod indicates internal seal wear. The attachment cylinder diagram identifies the rebuild parts.
Manual Section: Attachment Cylinder p. 16Control valve spool sticking
Sticky or unresponsive loader controls can come from the 2 spool control valve or its orifices. This section shows the valve, its mounts, and fittings for service.
Manual Section: 2 Spool Control Valve p. 18Quick-connect coupler failures
Loader hydraulics that quit when couplers are not fully seated or are damaged need the correct fittings and hoses. The external hydraulic kit section covers the front mounted pump, oil filter, and connecting lines.
Manual Section: External Hydraulic Kit Front Mounted Pump Oil Filter p. 11Frequently Asked Questions
Which machine does this parts catalog cover?
It is the factory parts catalog for the Kubota L1720 tractor loader, serial prefix 51604. It focuses on the loader hydraulic system, covering the pump, cylinders, control valve, and all hydraulic tubes and hoses.
Is this a parts catalog or a repair manual?
A parts catalog. It provides exploded illustrations, Kubota part numbers, quantities, and interchangeability notes for identifying and ordering parts, not step-by-step repair procedures.
Does it list the hydraulic hose sizes?
Yes. The Hydraulic Tubes And Hose Assemblies section details each hose with its diameter and length, such as the 1/2 inch hoses, plus the fittings and clamps that connect them. p. 5
Can I find the lift and attachment cylinder parts?
Yes. Separate exploded diagrams cover the Lift Cylinder and the Attachment Cylinder, identifying rods, seals, and related parts for a rebuild or replacement. p. 14
Is this Kubota L1720 Parts Catalog a digital download?
Instant PDF download. You get the full 21-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this Kubota L1720 manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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