Part of the Kubota Repair Manuals.
This is the Kubota factory assembly manual for the BH77 backhoe attachment, code number 7K503-7916-2. It walks a dealer or owner through unpacking the crate, checking the shipped parts, and building the backhoe onto the tractor for several mounting configurations, including the BH4972, BH4975, BH4976, and BH4988 variants.
The manual covers routing the hydraulic lines, fitting the sub frame, setting up the dipperstick and bucket, and then installing or removing the backhoe from the tractor. It also gives lubrication points, general bolt torque tables, adaptor and elbow torque values, and a post-assembly inspection checklist.
With it you can assemble a new BH77 correctly, torque the mounting hardware to spec, connect the hydraulics without leaks, and confirm the finished attachment before the first dig. It is a downloadable PDF you can view or print in the shop.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Cover and Contents | 1-3 | Assembly Instructions Code No. 7K503-7916-2, Full Table of Contents |
| To the Dealer | 4-5 | Preparations, Safety, Assembly and Adjustments, After Assembly Check, Before Assembling Equipment, Use Only Adequate and Required Equipment, Tools and Instruments |
| Unpacking and Checking Parts | 6-9 | Unpacking Wooden Crate, Checking Parts (Seat: Assy, Support), Bh4984, Bh4988, Bh4975B, Bh4996A, Bh4976A, Bh4986 |
| Tractor Preparation | 10-16 | Operating Seat, Operating Seat Support Link, Hydraulic Line |
| Sub Frame (BH4975) | 17-26 | Sub Frame, Cab Spacer BH4972, Rear Wheels, Hydraulic Line, Operator's Seat |
| Lever Stopper | 27-30 | Rear Wheels |
| Sub Frame | 31-39 | Hazard Light, Tool Box and Smv Emblem, Operator's Seat |
| Label | 40-43 | Rear Wheels |
| Hydraulic Line | 44-47 | Operating Seat, Backhoe Outlet Hose, Backhoe Inlet Hose, Loader Sub Frame, Optional Valve Cover, Rear Wheels, 3rd Function Hose, Hydraulic 2 Lever Quick Coupler |
| Tool Box | 48-53 | Assembly BH4996 BH4986, Hydraulic Line, Sub Frame |
| Rear Wheels | 54-55 | Installing the Stay for ROPS Connecting Bar |
| Setting Up the Backhoe | 56-58 | Dipperstick, Seat [Except BH4962 BH4963 BH4984], Step Plate [BH4962 BH4963 BH4984], Control Lever [BH4962 BH4963 BH4984], Bucket |
| Installing the Backhoe | 59-60 | Mech. Thumb BH1976 (Thumb Weldment, Pin, Adjust Link 1, Adjust Link 2, Set Adjust Pin), Remove the 3-Point Hitch and / or Drawbar, Make Sure the Swing Lock Pin Is Installed |
| Removing the Backhoe | 61-63 | Removal of the Backhoe, Set the Swing Lock Pin to Prevent the Pivoting of the Boom Before Removing the Backhoe, Stand Beside the Rear Tire, Fully Close the Dipperstick |
| Pre-Operation Check | 64-66 | Storage of the Backhoe, Lubrication, Transmission Fluid |
| Assembly Time | 67 | Assembly by One Worker, Following Tools and Equipment Are Available |
| Tightening Torque of Bolts and Nuts | 68 | |
| Tightening Torque of Adaptors, Elbows and Others | 69 | Adjustable Elbow, Adaptor, O-Ring Port, Hose Fitting, Flare Nut, Adaptor (NPT) |
| Check List for Inspection After Assembly | 70 | Seat Support Assy, Seat Stay, Seat Belt, Seat Belt Stay, Floor Seat Cover, Backhoe Seat, Rear Tires |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Sub frame M16 bolts tightening torque (BH4972, BH4975, BH4962, BH4963, BH4973, BH4996, BH4986) | 196 to 225 N-m | p. 18 |
| Hose fitting, Flare nut (UNF) 3/4 thread size tightening torque | 36 to 40 N-m | p. 69 |
| Backhoe inlet pipe / Female coupler tightening torque (BH4962, BH4963, BH4973) | 39 to 60 N-m | p. 28 |
| Control lever M6 x 16 bolts tightening torque (BH4962, BH4963, BH4984) | 9.8 to 11.2 N-m | p. 58 |
| General torque specification for M10 bolts (8.8 property class) | 48.1 to 55.8 N-m | p. 68 |
| Locking nut clearance (gap between boss and locking nut) for dipperstick assembly | 1 to 3 mm | p. 56 |
| Grease type for all grease fittings | SAE multipurpose grease | p. 64 |
| Mech. Thumb grease fitting thread size | 1/4 - 28T.T. X.68 | p. 59 |
| Operating Seat Tightening Torque | 7.5 to 10.7 N-m | p. 10 |
| Cab Spacer (BH4972) Tightening Torque | 368 to 431 N-m | p. 20 |
| Rear Wheels (BH4976, BH4988) Tightening Torque | 215 N-m | p. 21 |
| Backhoe Inlet/Outlet Pipe (BH77 kit) Tightening Torque | 39 to 60 N-m | p. 28 |
