Wrong part number means a wasted order and another day of downtime. This Kubota L1720 Loader Parts Catalog (OEM #70000-70024) runs 50 pages of exploded-view illustrations covering every major assembly: main frame and sub-frames, mounting brackets, hydraulic tube and hose assemblies, the 2-spool control valve with its decals and hoses, tractor hydraulic kits, and muffler relocator sections for L345, L345DT, L355SS, L305, and L305DT fits. Every illustration ties to OEM part numbers and catalog cross-references. The lift cylinder runs a 2-inch bore; hydraulic hoses spec at 1/2" x 26" and 1-1/2" x 18". Skip the worn paper fiche and the slow phone call to the counter. Open it on your tablet, tap the section, and walk up with the number already in hand.
What's Inside This Kubota L1720 LOADER Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| General Specifications | 5 | These Specifications Apply To, Valve, Relief Valve Setting, Pump |
| Safety | 6-8 | - |
| Tools and Test Equipment | 9 | General Torque Specification Table |
| Logical Steps To Trouble Shooting | 10 | Question The Customer And Operator, Make A Complete Physical Examination, Have Operator Simulate Problem, Then Try It Yourself, Verify The Performance Of Major Systems |
| Trouble Shooting | 11-13 | Loader Fails To Raise, Slow Or Erratic Lift, Lift Arms Not Lifting Equally, Loader Does Not Have Adequate Lift, Or Break Out Capacity |
| Flow Meter Testing | 14-18 | What Is A Flow Meter, Preliminary Checks (Oil Level, Check The Oil Filter And Replace As Necessary), Connecting The Flow Meter Test 1, Test 1 Pump Flow, Conclusion |
| Hydraulic Testing Without Flow Meter | 19-23 | Test 1 Relief Valve, Conclusion, Load Check Valve, Test 2 Load Check Valve (Lift Circuit, Bucket Circuit), Test 3 Internal Cylinder Leakage |
| External Hydraulic Pump | 24-25 | drive gear shaft, housing sections, screws, washers, driven gear, drive gear, dowel pins, wear plate |
| Control Valve | 26-27 | External Leakage, Excessive Internal Leakage, Spool Binding, Disassembly, Inspection, Reassembly |
| Cylinders | 28-29 | headcap, rod, piston nut, piston, spacer, head, wiper seal |
| Parts Catalog | 30-50 | O/L, Nss, Terms, Right & Left Hand, Catalog Changes, Parts Order, Bucket Level Indicator, Main Frame / Sub-Frames / Mounting Brackets |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Piston nut torque | 165 ft-lbs (22.8Kg-m) | p. 29 |
| Headcap torque | 25 ft-lbs (3.5Kg-m) | p. 29 |
| Hose, 1/2" x 26" | 1/2" x 26" | p. 35 |
| Hose, 1½" x 18" | 1½" x 18" | p. 35 |
| Lift Cylinder Bore | 2" dia. | p. 5 |
| Lift Cylinder Rod Diameter | 1.50" dia. | p. 5 |
| General Torque for 5/8" (15.88mm) Grade 5 Bolt (Min) | 150 ft-lbs (203.4 Nm) | p. 9 |
| General Torque for 5/8" (15.88mm) Grade 5 Bolt (Max) | 180 ft-lbs (244.1 Nm) | p. 9 |
| Maximum Lift Height (L345 Tractor) | 113.5" (2883mm) | p. 5 |
| Break-Away Capacity (L345 Tractor) | 2550 lbs. (1150Kg) | p. 5 |
| Lift Capacity at Full Height (L345 Tractor) | 1495 lbs. (680Kg) | p. 5 |
| Bucket Cylinder Bore | 2" dia. | p. 5 |
Kubota L1720 LOADER Common Problems This Manual Covers
Kubota L1720 loader main hydraulic pressure hose blown and missing the exact replacement part number p. 30
Check the Parts Catalog starting on page 30. Locate the hydraulic diagram to find the pressure line part number. Verify you need the 3/8" x 96" pressure hose listed on page 41. Cross-reference the number before ordering your replacement.
Manual Section: Parts CatalogBucket cylinder leaking fluid around the rod seal and needs an exact rebuild seal kit p. 45
Pull the hydraulic parts diagram on page 45 to read off the rod seal kit part number. Confirm your machine runs the standard 2" dia. bucket cylinder bore first, then order the matching kit and rebuild the cylinder.
Manual Section: Parts CatalogLoader mounting hardware stretched or missing and the frame feels loose during heavy lifting p. 32
Check the mainframe/sub-frame mounting brackets diagram on pages 32-33 for the exact pins and bushings. The 5/8" (15.88mm) Grade 5 bolts need to hold a 150 ft-lbs (203.4 Nm) minimum torque, so order to that grade and tighten the frame back down.
Manual Section: Parts CatalogBucket level indicator linkage bent from a front impact and will not track correctly p. 30
Examine the bucket level indicator components in the parts catalog starting on page 30. Look up the exact replacement rods and brackets for the damaged linkage. Confirm the new assembly matches the 113.5" (2883mm) maximum lift height specification geometry to restore proper tracking.
Manual Section: Parts CatalogFrequently Asked Questions
What are the torque specs for Kubota L1720 loader mounting bolts?
This table covers the common bolt sizes and grades. A 5/8" Grade 5 bolt takes 150-180 ft-lbs (203.4-244.1 Newton-Meters), while a 1/2" (12.70mm) Grade 5 bolt takes 80-96 ft-lbs (108.5-130.2 Newton-Meters). Keep in mind that plated hardware needs those torque values reduced by 25%.
How to bleed hydraulic lines on Kubota L1720 loader
Run the lift cylinders through their full travel several times to push trapped air out of the mainframe (lift) cylinders. Keep the reservoir at the correct level the whole time. Cycling the cylinders this way clears air from the hydraulic system.
What are the replacement specifications for Hydraulic hoses?
You'll find the hydraulic hoses listed by part number and size. The 70050-01017 is a "Hose, 1/2" x 26"", the 70050-01093 a "Hose, 3/8" x 28"", and the 70050-01135 a "Hose, 72"". Others cover 70050-01116 for "Hose, 3/8" x 96" (Pressure)", 70050-01127 for "Hose, 1" x 103" (Suction)", and 70050-01115 for "Hose, 1/4" x 12" (Return)".
Is this Kubota L1720 LOADER Parts Catalog a digital download?
This is a 50-page searchable PDF that downloads the moment checkout clears. It opens on a laptop, tablet, or phone, so you can take it straight to the shop floor.
Is this Kubota L1720 LOADER Parts Catalog printable?
Yes. Print as many copies as you like, with no restrictions. Most mechanics just run off the one section they need and keep it on the bench.
Document Quality
This is a scanned PDF document, but it includes an OCR layer, allowing you to search and copy text from its contents. The text quality is generally crisp and easy to read throughout, with only minor blurriness typical of a scanned manual. All diagrams and illustrations are raster images, not vector, but their labels remain clearly readable. The pages are clean with no significant stains, marks, or skewing, though some exhibit a slight curve from the original binding, and a few blank pages are present as part of the original manual structure.
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