Part of the Kubota Parts Manuals.
Finding the correct part number for your Kubota BH90 Backhoe Attachment shouldn't require guessing. This 65-page Kubota bh90 parts catalog pdf breaks down every component, from the main frame and boom to the dipperstick and bucket link. You will see all five hydraulic cylinders separated into individual seals and bushings. Exploded-view illustrations pair with numbered parts list tables, allowing you to match the REF number directly to the factory part. Hydraulic hose routing features dedicated sections for intake, swing, boom, bucket, and stabilizer lines. The manual also covers Mount Kit variants (AB and C-F), control lever assemblies, and seat components. Specific hardware details are included, such as the 1/8-27NPT grease fitting thread and the 1.50 x 10.20 inch boom pin. Because the file is bookmarked and searchable, you can quickly jump to the exact assembly you need.
What's Inside This Kubota BH90 Parts Manual
| System | Pages |
|---|---|
| Main Frame | - |
| Sub Frame | - |
| Swing Frame | - |
| Swing Cylinder | - |
| Boom | - |
| Dipperstick | - |
| Bucket Link | - |
| Bucket | - |
| Stabilizer Arm | - |
| Control Valve | - |
| Control Valve [Component Parts] | - |
| Hydraulic Hose (Intake) | - |
| Hydraulic Hose (Inlet/Outlet) | - |
| Hydraulic Hose (Swing) | - |
| Hydraulic Hose (Boom/Dipper) | - |
| Hydraulic Hose (Bucket) | - |
| Hydraulic Hose (Stabilizer) | - |
| Cylinder (Swing) [Component Parts] | - |
| Cylinder (Boom) [Component Parts] | - |
| Cylinder (Dipper) [Component Parts] | - |
| Cylinder (Bucket) [Component Parts] | - |
| Cylinder (Stabilizer) [Component Parts] | - |
| Step | - |
| Seat | - |
| Control Lever 1 | - |
| Control Lever 2 | - |
| Label | - |
| Mount Kit (Ab) | - |
| Mount Kit (C-F) | - |
Every system also includes a part list.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| FITTING GREASE thread size | 1/8-27NPT | p. 5 |
| PIN 1 dimension | 1.875*5.22 | p. 9 |
| HEX.BOLT thread size | 3/8-24UNF*5/8 | p. 9 |
| BUSH dimension (Swing Cylinder) | 32*51 | p. 11 |
| PIN dimension (Boom) | 1.50*10.20 | p. 13 |
| BUSH dimension (Boom) | 38*70 | p. 13 |
| PIN SPRING COILED dimension | 3/8*2 | p. 19 |
| CIR-CRIP EXTERNAL dimension | 1 1/4 | p. 23 |
| PIN COTTER dimension | 1/4*2 | p. 23 |
| ASSY ELBOW ADJ dimension | 9/16 | p. 25 |
| HEAD dimension (Swing Cylinder) | 60*35 | p. 42 |
| NUT thread size (Swing Cylinder) | M24*2 | p. 42 |
Kubota BH90 Common Problems This Manual Covers
Control lever feels sloppy or sticky, requiring correct linkage and spool-valve seal part numbers
Review the Control Lever 1 parts list starting on page 56, followed by Control Lever 2 on page 58 for linkage hardware. You can cross-reference the Control Valve Component Parts list on page 26 to identify specific spool-valve seals and o-rings by item number. Always match parts to your serial number range.
Manual Section: Control Lever 1 p. 56Stabilizer arm binds or moves unevenly, need the right pivot pin and retaining hardware part numbers
Open the Stabilizer Arm parts diagram on page 22. Locate the pivot pins, the CIR-CLIP EXTERNAL (1 1/4" listed on page 23), and the COTTER PIN (1/4x2) in the parts list. Cross-reference the Cylinder(Stabilizer) Component Parts on page 49 to confirm you have the correct seal kit part numbers if the cylinder itself is involved.
Manual Section: Stabilizer Arm p. 22Boom cylinder loses smooth motion, need component seal kit and head part numbers
Go to Cylinder(Boom) Component Parts on page 43. The parts list breaks down the boom cylinder into individually numbered seals, wipers, and the piston assembly. If you also need the swing cylinder head, that is listed separately at page 41 with HEAD dimension 60x35 (page 42). Order by item number and verify serial number applicability before purchasing.
Manual Section: Cylinder(Boom) [Component Parts] p. 43Frequently Asked Questions
What are the replacement specifications for control linkages?
For control linkage components, the manual lists specific part numbers and their weights. For example, "LINK 1 GUIDE" has part number 75595-41110 and weighs 3.67 kgf (8.074 lb), while "LINK 2 GUIDE" is part number 75595-41150 and weighs 3.7 kgf (8.14 lb). Additionally, "END ROD 1" is part number 36730-81960, weighing 0.025 kgf (0.055 lb). p. 17
What are the replacement specifications for spool-valve seals?
Replacement specifications for spool-valve seals, identified as O-RINGS, are detailed within the control valve component parts. For instance, O-RING part number 75540-61820 weighs 0.001 kgf (0.0022 lb), and O-RING part number RB401-70020 weighs 0.002 kgf (0.0044 lb). Various other O-RINGs are listed with part numbers like 75595-64220, 04817-00110, 04816-00120, and 04817-00140, each weighing 0.001 kgf (0.0022 lb) and available in quantities from 1 to 7. p. 27
How quickly can I access this manual after buying?
Immediate download of the complete 65-page searchable Parts Catalog. Access it on any device, laptop at your desk or phone in the field.
Am I able to print pages from this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this Kubota BH90 Parts Catalog cover the hydraulic system?
Yes, but as a parts catalog it shows exploded parts diagrams with OEM part numbers, not circuit-level wiring diagrams. It covers hydraulic components including the pump, control valve, cylinder, and oil lines, all with detailed exploded views and numbered part lists.
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