Part of the Kubota Repair Manuals.
Before you crack a fitting on the boom cylinder or tee a gauge into the pump line this afternoon, the Kubota KX61-3, KX71-3 service manual PDF (Kubota part 97899-61050) puts 458 factory pages for both compact excavators on your screen. Hydraulic work takes up close to half the book: pump flow and pressure measurement tests, swivel motor and reduction gear teardown, pilot valve and TPSS valve rebuilds, and hose routing lists that trace each pilot, high pressure, suction and return line back to the tank. Wire harness diagrams, coupler layouts and circuit tests close out the book. Retire a front attachment pin once it wears 1.0 mm under size, and bring a 1/2-inch hose union nut to 58.8 to 63.7 N·m. A swivel motor rebuild can sit half done over one missing figure. Bookmarked and text searchable, this copy finds that number fast, so your machine is back on its tracks and digging.
What's Inside This Kubota KX61-3, KX71-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-24 | Body and Engine Identification Marks, Safety Precautions for Servicing |
| Machine Body | 25-92 | Specifications, Front Attachment, Cab Canopy Installation, Under Carriage |
| Engine | 93-226 | Engine Accessories, Engine Dismounting and Remounting, Engine Mechanism, Engine Service |
| Troubleshooting | 227-240 | Common Circuit, Hydraulic System, Pump, Motor, Swivel Performance, Traveling Performance |
| Specifications | 241-269 | Pump Specifications, Control Valve, Swivel Performance, Traveling Performance, Cylinder Speed, Natural Fall |
| Testing | 270-306 | Pump Flow, Pressure Measurement, Operating Speed, Cylinder Natural Fall, Lever Operating Force, Lever Stroke |
| Disassembling and Assembling - Front Attachment and Pump | 307-342 | Front Attachment Assembly, Pump Dismounting, Pump Reassembling, Control Valve, Pilot Valve |
| Disassembling and Assembling - Swivel Motor and Reduction Gear | 343-376 | Swivel Motor Disassembling, Swivel Motor Reassembling, Reduction Gear Case, Bearing Replacement, Oil Seal |
| Disassembling and Assembling - Cylinder and Valves | 377-403 | Boom Cylinder, Pilot Filter, Change Valve, TPSS Valve |
| Hydraulic Tank and Hose Routing | 404-424 | Hydraulic Oil Tank, Pilot Hose List, High Pressure Hose, Suction Hose Route, Return Drain Hose |
| Electrical System | 425-458 | Wireharness Diagram and Couplers, Troubleshooting and Testing, Wire Harness Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hose screw union nut section (1/8") | 7.8 ~ 11.8 N·m | p. 16 |
| Hose screw union nut section (1/4") | 24.5 ~ 29.4 N·m | p. 16 |
| Service limit of pin dia. | -1.0 mm (-0.04 in.) | p. 31 |
| Service limit of front bushing | +1.0 mm (+0.04 in.) | p. 32 |
| Bucket link clearance | 0.6mm | p. 47 |
| Fan belt deflection | 10 to 12 mm (0.394 to 0.472 in.) | p. 97 |
| Injection nozzle pressure | 13.73 to 14.71 MPa (140 to 150 kgf/cm², 1991 to 2133 psi) | p. 134 |
| Air filter element cleaning air pressure | 690 kPa (7 kgf/cm², 100 psi) | p. 163 |
| Fan belt tensioning force | 98 N (10 kgf, 22 lbs) | p. 162 |
| Swivel motor brake valve setting pressure | 17.7 MPa (180.00 kgf/cm²) | p. 249 |
| Swivel motor brake valve cracking pressure | 15.7 MPa (160.00 kgf/cm²) | p. 249 |
| Slow-blow fuse | 50A | p. 433 |
Kubota KX61-3, KX71-3 Common Problems This Manual Covers
Kubota KX61-3 and KX71-3 engine during long digging shifts under load keeps overheating
Check the V1505 fan V-belt first: it should deflect 7 to 9 mm under 58.8 to 68.6 N (6 to 7 kgf) of thumb pressure, per page 96. The cooling system uses a pressurized radiator rated 0.088 MPa (0.9 kgf/cm²), listed on page 95, so test the cap at that pressure. If both pass, follow the overheating chart before pulling the radiator.
Manual Section: Engine Troubleshooting p. 96Hydraulic functions slow or weak across boom, arm and bucket, sometimes total hydraulic system failure
Inspect the return and suction filters at the hydraulic tank first, following page 405. Reinstall the return filter assembly at 24.0 to 25.0 N·m and the suction filter at 58.8 to 68.6 N·m. If the machine stays weak, follow the entire hydraulic system failure chart starting on page 230.
Manual Section: Hydraulic System Troubleshooting p. 230Swing overruns past the stop point or slams with high shock at swivel start and stop
Test the swivel motor brake valve before condemning the motor. Measure setting pressure against 17.7 MPa and cracking pressure against 15.7 MPa, both listed on page 249. Verify the parking brake friction torque reaches 68.40 N·m on the same page. Then work through the overrunning and shock checks in the swivel performance troubleshooting.
Manual Section: Swivel Performance TroubleshootingMachine zigzags in straight travel or one side runs slow with low travel force
Check the traveling performance troubleshooting chart on page 241 for zigzagging, slow speed and low force before splitting anything. If the travel motor comes off, torque the track frame sprocket to 103.0 to 117.7 N·m on reassembly per page 364, and tighten the wheel motor plug to 167 to 196 N·m (page 367).
Manual Section: Traveling Performance Troubleshooting p. 241Front attachment pins and bushings worn with excess play at the boom and arm joints
Measure each front pin diameter with a micrometer and replace it once wear reaches the 1.0 mm (0.04 in.) service limit on page 31. Measure the bushing bore too; replace the bushing when it grows 1.0 mm over standard, per page 32. Check every boom, arm and bucket joint while the attachment is grounded.
Manual Section: Machine Body p. 31Starter does not run, or the engine turns over but will not start when cold
Check the 50A slow-blow fuse first, then the 10A fuse and the 5A glow relay fuse listed on page 433. Replace any blown fuse with the same rating. If the fuses test good, follow the starter failure and cold starting checks in the same electrical troubleshooting section before replacing the starter.
Manual Section: Electrical System Troubleshooting p. 433Frequently Asked Questions
What are the torque specifications for the Kubota KX71-3 final drive sprocket mounting bolts?
The tightening torque for the track frame sprocket mounting bolts on the KX71-3 is 103.0 to 117.7 N·m (10.5 to 12.0 kgf·m). This procedure is detailed in the Hydraulic System section. p. 364
What are the replacement specifications for the swivel motor on the Kubota KX61-3, KX71-3?
The swivel motor drain amount should be 20 to 60 cc/min during swiveling (R, L) at 65 kgf/cm² pressure. For swivel lock (R, L), the drain amount is 200 to 600 cc/min at 212 kgf/cm² (relieving). p. 257
What is the tightening torque for the cylinder head screws on the Kubota KX61-3, KX71-3 engine?
The tightening torque for the cylinder head screws is 63.7 to 68.6 N·m (6.5 to 7.0 kgf·m). p. 145
What is the specified valve clearance for the engine on the Kubota KX61-3, KX71-3?
The valve clearance (cold) for the engine is 0.145 to 0.185 mm (0.0057 to 0.0072 in.). p. 149
What is the engine oil pressure at rated speed on the Kubota KX61-3, KX71-3 (V1505 engine)?
The V1505 engine oil pressure at rated engine speed is 196 to 441 kPa, per the engine specification table on page 95. p. 95
How is this Kubota KX61-3 Service Manual delivered?
This is a 458-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Does this Kubota KX61-3 manual allow printing?
Yes. Print the pages you need for the job in your own shop, and bin them when they get greasy.
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