Need the factory operator manual for your Kubota L1720 Loader? Covering the L305, L305DT, L345, L345DT, and L355SS tractors, this 38-page guide (OEM #70000-70186) runs from first-day installation through scheduled maintenance. The setup section walks tractor prep, bracket mounting, and hydraulic line routing; from there it moves to cold-weather starts, handling for material buckets, forks, tines, and dozers, and a troubleshooting chart sorted into loader faults, oil leaks, and physical damage. Maintenance coverage spans lubrication points, hose and fitting checks, filter replacement, and oil level checks. Relief pressure runs 1800 PSI on the L305 and 2000 PSI on the L345 or L355SS, and your first filter change comes at the 30-hour mark. Bookmarked sections and keyword search put any spec a click away.
What's Inside This Kubota L1720 LOADER Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| To The Purchaser | 3 | Contents, Mr. Purchaser, Watch For This Alert Symbol |
| Directional Reference | 4 | Parts And Service |
| Safety | 5-7 | - |
| Loader Set-Up & Installation | 8-9 | Tractor Preparation, Loader Preparation & Bolt Torque, Loader Installation Instruction |
| Loader Installation Instructions | 10-14 | Model L1720 Loader For Kubota L305, L305DT, L345, L345DT Or L355SS Tractors, Uncrate And Identify Mounting Kit, Valve And Miscellaneous Parts |
| Pre-Delivery Inspection And Orientation | 15 | Dealer Inspection (Tractor, Loader), Dealer Owner Orientation (Review And Explain The Following Items With The Customer, Give The Customer This Operators Manual) |
| Operation | 16-18 | Hydraulic System, Cold Weather Operation, Loading The Attachment, Raising The Load, Unloading The Attachment, Handling The Load |
| Attachments And Options | 19-21 | Material Handlers, Material Buckets, Bucket Level Indicator |
| Lubrication And Maintenance | 22-24 | Look For Trouble, Lubrication, Oil Level Check And Change, Cylinders, Tubing, Hoses, And Fittings, Valve |
| Trouble Shooting | 25-26 | A. Loader Operation, B. Oil Leaks, C. Damage |
| Reference Drawings | 27-33 | Muffler Relocator L305-L305DT, Muffler Relocator L345-L345DT, Material Buckets And Tines, Loader And Mounting Brackets, Bucket Level Indicator, Loader Hydraulic Tubes And Hoses |
| Notes | 34-38 | External Hydraulic Kit (Pump And Reservoir), Tractor Hydraulic Kit, Kubota Tractor Corporation, Printed In U.S.A. |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic system break-in cycle time after air removal | 15 minutes | p. 16 |
| Hydraulic relief pressure for L305 tractor system | 1800 P.S.I. | p. 14 |
| Hydraulic relief pressure for L345 and L355SS tractor system | 2000 P.S.I. | p. 14 |
| General torque for 5/8" (15.88mm) Grade 5 bolts | 150-180 ft-lbs (203.4-244.1 Nm) | p. 9 |
| Hydraulic filter replacement interval (first) | 30 hours | p. 23 |
| Hydraulic filter replacement interval (thereafter) | 150 hours or once every season | p. 23 |
| External Hydraulic Kit Pressure Hose dimension | 3/8" x 96" | p. 35 |
| External Hydraulic Kit Suction Hose dimension | 1" x 103" | p. 35 |
| Greasing frequency for points marked with 10 | TWICE DAILY or EVERY 5 HOURS | p. 22 |
| Greasing frequency for points marked with 10 with a line through it | DAILY or EVERY 10 HOURS | p. 22 |
| Maximum Lift Height | 113.5 inches | p. 4 |
| Break-Away Capacity | 2450 lbs. | p. 4 |
Kubota L1720 LOADER Common Problems This Manual Covers
Kubota L1720 loader arms lift slowly, jerk, or lose power mid-cycle p. 25
Check hydraulic oil level first. The reservoir holds 7.25 gallons; fill to the full mark before operating. If level is correct, cycle the lift and attachment circuits slowly for 15 minutes to purge trapped air from the system. Inspect all hoses, fittings, and cylinder connections for weeping or active leaks while cycling.
Manual Section: Trouble ShootingLoader operation feels erratic or sluggish in cold weather p. 16
Warm up the tractor at low idle before engaging the loader. Run engine at minimum 1200 RPM once warm, then cycle the lift arms and bucket through full range several times to bring hydraulic fluid up to operating temperature. Check the troubleshooting chart on page 25 if sluggishness continues after warm-up.
Manual Section: OperationHydraulic oil foaming or system making noise during loader use p. 25
Shut down and inspect for air entry points: check all suction-side fittings and hoses for loose connections. Verify oil level is at the full mark (7.25-gallon capacity). If the first oil change has not been done, change the hydraulic filter and fluid now; the first service interval is 30 hours, then every 150 hours thereafter.
Manual Section: Lubrication And MaintenanceOil leaking at cylinder pins, pivot points, or hose connections p. 22
Inspect all 12 loader and cylinder pivot grease points. Points marked for daily service require grease every 10 hours; heavily loaded pivot points require greasing twice daily or every 5 hours. Wipe fittings clean before greasing. Check hose connections and cylinder rod seals for weeping; trace any wet spots to their source using the leak diagnosis chart on page 25.
Manual Section: Lubrication And MaintenanceLoader cylinders drift or settle slowly when controls are in neutral p. 25
Consult the troubleshooting chart on page 25 for cylinder-settling causes. Inspect the control valve spools for contamination or binding by cycling controls fully and feeling for smooth, consistent resistance. Check all cylinder rod seals and fittings for external leaks. Verify hydraulic oil is clean and at the correct level before further diagnosis.
Manual Section: Trouble ShootingHydraulic filter service overdue, oil milky or dark after seasonal storage p. 24
Replace the hydraulic filter element. First replacement is at 30 hours; after that, change every 150 hours or once per season, whichever comes first. Drain and refill the 7.25-gallon reservoir with fresh fluid at the same interval. Inspect the filter for metal particles or debris, which can indicate internal wear requiring dealer attention.
Manual Section: Lubrication And MaintenanceFrequently Asked Questions
How to reset Kubota L1720 loader hydraulics?
Cycle the loader lift and attachment cylinders until all air leaves the hydraulic system and the unit runs smoothly. With the air purged, keep cycling the lift and bucket circuits (no load) for 15 minutes to warm the oil and break in the seals. If it still feels jerky from cold oil or trapped air, run the loader several times with the tractor at half throttle.
What are the torque specs for Kubota L1720 loader mounting bolts?
Torque every bolt to the value listed in the General Torque Specification Table on page 9. A 5/8" Grade 5 bolt, for example, takes between 95-105 foot-pounds (128.7-142.3 Newton-Meters). Keep in mind that plated hardware should have its torque values reduced by 25%.
Why is my Kubota L1720 loader not lifting?
Weak lift capacity usually traces to a few causes: worn or defective lift cylinder seals, a worn or damaged hydraulic pump, or a faulty relief valve in the tractor system or external selective control valve. A load heavier than the loader's rated capacity will also keep it from lifting. Fixes range from replacing the cylinder seal kits to asking your Kubota dealer for a pressure (PSI) check and relief valve replacement, or simply lightening the load.
how to reset Kubota L1720 loader
After installation or maintenance, raise and lower the mainframe, then lift the attachment about 4 feet (1 meter) off the ground and work the bucket cylinders through two or three cycles with the R.H. control lever. That sequence pushes air out of the hydraulic system so the loader runs smoothly. For initial break-in, cycle the lift and bucket circuits (no load) for 15 minutes.
how to bleed Kubota L1720 loader hydraulics
Bleeding the hydraulics means working the loader lift and attachment cylinders until every bit of air clears the system and the unit moves smoothly. Once the air is gone, keep the lift circuit and bucket circuit cycling (with no load) for a full 15 minutes. That extra run time warms up the oil and breaks in the seals.
Is this Kubota L1720 LOADER Operator Manual a digital download?
This is a 38-page searchable PDF, and it downloads the moment you check out. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Is this Kubota L1720 LOADER Operator Manual printable?
Yes. Print as many copies as you like; there are no restrictions. Plenty of mechanics just run off the one section they need and keep it in the cab.
Document Quality
This document is a scanned copy of the original manual, featuring an OCR layer that allows you to search and copy text. The text quality is generally good and readable, though some areas show minor fading or scan artifacts from the original print. Diagrams and illustrations are raster images, meaning they may appear slightly pixelated when zoomed in, but their labels are mostly legible. You will notice some scan artifacts, minor speckles, and occasional slight page skewing throughout the document, along with two blank pages (pages 2 and 37).
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