Need the factory operating specs for your Kubota 629 or 619B backhoe? This 28-page Operator Manual PDF (OEM #Kubota-629-619B-MANUAL) walks you through every control, safety warning, and maintenance interval. A simplified hydraulic hose diagram lays out the full fluid routing, while the troubleshooting chart covers eight failures, from oil overheating to erratic operation. Both control patterns are spelled out: the standard 6-lever and the optional 4-lever. Maintenance is split into 8-, 25-, 40-, and 200-hour intervals, alongside specifications for cycle times, weights, and the hydraulic system. The bucket hose measures 117 inches (297.18 cm) open and 103 inches (261.62 cm) closed, so you can order the right replacement before the old one splits. A blown hose mid-dig stops the whole job. Bookmarked and searchable; jump straight to troubleshooting or pull up any spec by keyword.
What's Inside This Kubota 629, 619B Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 3-3 | Operating Criteria, Hydraulic System, Cycle Times, Weights, Optional Equipment |
| Standard 6-Lever Control | 4-5 | - |
| Optional 4-Lever Control | 6-7 | Special Safety Precautions |
| Trouble Shooting | 8-8 | Backhoe Will Not Operate, Backhoe Operates Erratically, Oil Overheating, Cylinder Leaking, Operation Slow, Valve Sticking, Excessive Wear, Excess Wear Or Breakage |
| Maintenance | 9-9 | Every Eight Hours Of Operation, Every Twenty-Five Hours Of Operation, Every Forty Hours Of Operation, Every Two Hundred Hours Of Operation |
| Hydraulic Cylinder Maintenance | 10-10 | Cylinders (Disassembly, Cleaning And Inspection, Assembly) |
| Cylinder Assembly | 11-11 | - |
| Hydraulic Valve Maintenance | 12-12 | Control Valves (Disassembly, Assembly) |
| Control Valve Assembly | 13-13 | - |
| Mounting Instructions | 14-14 | - |
| Kubota K629 Backhoe | 15-15 | - |
| Pump Assembly | 16-16 | - |
| Seat Swivel Assembly | 17-17 | - |
| Belly Bracket Assembly | 18-18 | - |
| Bucket Assembly | 19-19 | - |
| Boom Assembly | 20-20 | - |
| Mainframe Assembly - Lower | 21-21 | - |
| Mainframe Assembly - Upper | 22-22 | - |
| Control Section Assembly | 23-23 | - |
| Control Section Assembly - 4 Lever Control | 24-24 | - |
| Stabalizer Assembly | 25-25 | - |
| Hose Assembly | 26-26 | - |
| Helpful Hints | 27-27 | Digging Hints, Hose Damage, Pump Care, Soft Soil Conditions, When In Doubt |
| Simplified Hose Diagram | 28-28 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder Piston Locknut Torque | 150 ft. lbs. | p. 10 |
| Valve Tie Rod Torque (Final) | 125 inch lbs. | p. 12 |
| Hose, Bucket Open Length | 117 inches (297.18 cm) | p. 26 |
| Hose, Bucket Closed Length | 103 inches (261.62 cm) | p. 26 |
| Mainframe Assembly Machine Bolt Size | 3/16 x 1 1/2 | p. 21 |
| Grease Fitting (Zert) Part Number | 648 | p. 19 |
| Control Valve O-ring Part Number | 1058 | p. 13 |
| Hydraulic System Operating Pressure | 1800 P.S.I. | p. 3 |
| Hydraulic System Relief Valve Setting | 1850 P.S.I. | p. 8 |
| Operating Pressure | 1800 P.S.I. | p. 3 |
| Maximum Digging Depth | 6.0 ft | p. 3 |
| Swing Radius | 135 Degrees | p. 3 |
Kubota 629, 619B Common Problems This Manual Covers
Kubota 629 backhoe control levers feel loose with noticeable play and squeak during operation p. 8
Inspect the control linkage pivot pins, bushings, and tie bolts for wear and looseness. Grease every zerk fitting on the every-forty-hours schedule shown on page 9. The excessive-wear row of the page 8 troubleshooting chart covers the same symptom. Torque the control valve tie rods to 125 inch lbs.
Manual Section: Excessive Component Wear or BreakageStabilizers and boom slowly drift down on their own after the machine is parked p. 8
Check the page 8 troubleshooting chart under cylinder leaking, which points to damaged seals. Lower the stabilizers fully, then watch for downward creep. The hydraulic system runs at 1800 P.S.I., so an internal seal leak shows up fast. Schedule a seal kit replacement for any cylinder that drifts.
Manual Section: Hydraulic Cylinder LeakingDigging and boom movements feel slow and weak with little lifting power p. 8
Verify the hydraulic oil level sits between the MIN and MAX marks. Run the tractor at the normal 1200-1600 r.p.m., since low RPM starves the pump. Page 8 lists slow operation in its troubleshooting chart. Inspect the hydraulic filter and replace it if clogged.
Manual Section: Slow Backhoe OperationHydraulic oil seeping around hose fittings, cylinder rods, or the valve stack p. 27
Examine every hose, fitting, and O-ring for cracks, weeping, or loose connections. The system operates at 1800 P.S.I., so even a small seal failure sprays oil under pressure. The hose care notes on page 27 walk through what to look for. Replace cracked hoses and tighten fittings before the next job.
Manual Section: Helpful HintsBackhoe runs but attachment performance is poor and sluggish after sitting in storage p. 9
Sample the hydraulic oil for contamination or water, and drain it if cloudy. Per the page 9 maintenance schedule, the oil gets replaced every 200 hours. Grease all linkage pins and zerk fittings to free corroded pivots. Cycle each function slowly to purge trapped air.
Manual Section: MaintenanceFrequently Asked Questions
How do I reset the Kubota 629/619B backhoe hydraulics?
The manual describes no dedicated "reset" procedure. If you are chasing problems like excess wear, you can check and adjust the hydraulic relief valve instead. Set the pressure to 1850 P.S.I.; one full turn of the adjustment screw shifts it by roughly 700 P.S.I., as the page 8 troubleshooting guide explains.
What are the torque specs for Kubota 629 backhoe mounting bolts and cylinder pins?
Page 10 calls for 150 ft. lbs. of torque on the cylinder piston locknut during assembly. The control valve tie rods get a final torque of 125 inch lbs. (page 12). The manual lists no torque values for the main backhoe mounting bolts or the cylinder mounting pins.
How do I bleed air from the hydraulic system on a Kubota 629 backhoe?
Bleed the air by operating the cylinders once the reservoir is filled with fluid. The page 14 mounting instructions put it directly: "Work cylinders, after filling to evacuate system of any trapped air." The troubleshooting guide echoes this, listing "Evacuate system of air" as the fix for erratic operation.
Where is the serial number plate located on a Kubota 629 backhoe?
You will find the serial number on the lower mainframe of the backhoe. The page 21 diagram, titled "MAINFRAME ASSEMBLY - LOWER," carries a callout box labeled "BACKHOE SERIAL NUMBER" pointing straight at the main housing structure.
What do I get after purchasing this Kubota 629, 619B manual?
A 28-page Operator Manual in searchable PDF, ready the moment your checkout completes. Open it on a computer, tablet, or phone, with no shipping wait.
Can I print this Kubota 629, 619B manual?
Yes. Print as many copies as you want; there are no restrictions. Many mechanics print just the section they need and carry it to the shop floor.
Does this Kubota 629, 619B Operator Manual cover the hydraulic system?
Yes. The manual includes hydraulic circuit diagrams, system schematics, and component specifications with pressure ratings.
Document Quality
This is a scanned copy of the original manual, and a text layer has been added, so you can search the document and copy text. The text is generally clear and easy to read, though it's not as sharp as a digital-native document, and some pages have minor scan artifacts or a slight skew. The diagrams, parts lists, and illustrations are raster images from the scan; they are legible and useful for identifying components, but labels and lines will appear pixelated when you zoom in closely.
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