Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the RCK60-30BB and RC72-30BB mid-mount mower decks, the cutting units fitted to Kubota tractors. Across 81 pages it is the factory service documentation, organised into Supplementary Information, Safety, General, Maintenance, and Mower sections covering setup, service specifications, and full servicing of the deck.
The manual lists Kubota's own figures, including a gear box oil capacity of 0.36 L using SAE 90 API GL5 gear oil, blade bolt torque of 102 to 117.6 N·m, a cutting height range of 38 to 102 mm, and bevel gear backlash of 0.13 to 0.25 mm. Maintenance schedules, tightening torques, troubleshooting charts, and power transmission diagrams let an owner or mechanic replace blades, service the gear box, set backlash, and keep the deck cutting cleanly.
It downloads as a searchable, printable PDF.
What's Inside This Kubota RCK60-30BB, RC72-30BB Manual
| System | Pages | Key Topics |
|---|---|---|
| Supplementary Information | 3-6 | Model Name and Related Manuals, Manual Applicability, Model Name |
| Safety | 7-15 | Safety First, Working Precautions, Preparing for Emergencies, Working Cautions, Starting Machine Safely, Preventing Fires, Preventing Acid Burns, Avoiding High Pressure Fluid |
| General | 16-48 | Tightening Bolts and Nuts, Applying Thread-Locking Fluid, Installing Circlips, Installing Spring Pins, Handling Split Pin, Handling Chain Joint and Split Pin |
| Maintenance | 49-63 | Maintenance Check List, Lubricants, Check and Maintenance, Checking and Changing the Gear Box Oil, Greasing, Checking and Replacing the Blade, Cleaning the Mower Deck |
| Mower | 64-78 | Mechanism, Structure of Power Transmission of Mower, Structure of Lifting Mechanism of Mower, Servicing, Troubleshooting for Mower, Service Specifications for Mower |
| Contact Information | 81 | Editor, Address, Phone, Fax, E-Mail, Kubota Corporation, Printed in Japan, Code No |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Gear box mounting bolt and nut (M12 standard type) torque | 77.4 to 90.2 N·m | p. 70 |
| Blade bolt torque | 102.9 to 117.7 N·m | p. 70 |
| Gear box oil capacity | 0.36 L | p. 52 |
| Gear box oil type | SAE 90 API GL5 gear oil | p. 52 |
| Blade bolt tightening torque | 102 to 117.6 N·m | p. 59 |
| Bevel gears backlash (Service specification) | 0.13 to 0.25 mm | p. 69 |
| Bevel gears backlash (Service limit) | 0.4 mm | p. 69 |
| Cutting height range | 38 to 102 mm | p. 32 |
| RCK60-30BB | ||
| Pinion shaft turning force | Less than 56 N | p. 69 |
| Weight (approximation) | 170 kg | p. 32 |
| RC72-30BB | ||
| Pinion shaft turning force | Less than 118 N | p. 69 |
| Weight (approximation) | 210 kg | p. 32 |
Kubota RCK60-30BB, RC72-30BB Common Problems This Manual Covers
Uneven or scalped cut
Streaking, scalping, or a stepped finish traces to blade wear, deck leveling, or drive faults. The Mower section covers the deck mechanism, servicing, and troubleshooting for the cutting unit.
Manual Section: Mower p. 64Blade wear or damage
Dull, bent, or cracked blades cut poorly and shake the deck. The Maintenance section covers checking and replacing the blade along with the correct blade bolt torque.
Manual Section: Maintenance p. 49Gear box oil leakage
Oil weeping from the gear box points to a worn seal or overdue service. The Maintenance section covers checking and changing the gear box oil and its 0.36 L capacity.
Manual Section: Maintenance p. 49Excessive gear noise or backlash
Whine or knock from the deck gear box signals bevel gear wear beyond the 0.13 to 0.25 mm backlash spec. The Mower section gives the service specifications and servicing steps.
Manual Section: Mower p. 64Drive belt slip or wear
A slipping or worn belt drops blade speed and cut quality. The Mower section documents the power transmission structure of the deck and the servicing needed to restore it.
Manual Section: Mower p. 64Loose blade bolts
Blade bolts that back off risk damage and vibration. The Maintenance section gives the blade replacement procedure and the 102 to 117.6 N·m bolt torque to secure them.
Manual Section: Maintenance p. 49Frequently Asked Questions
Which mower decks does this manual cover?
It covers the Kubota RCK60-30BB and RC72-30BB mid-mount mower decks. The specifications note the differing weights and blade spindle speeds between the two units.
Does it give the blade bolt torque?
Yes. The General section lists tightening torques, and blade bolt torque is specified at 102 to 117.6 N·m in the deck servicing data so blades are secured correctly. p. 16
How much gear box oil does the deck take?
The gear box holds 0.36 L of SAE 90 API GL5 gear oil. The Maintenance section covers checking and changing this oil and the recommended service intervals. p. 49
Does it cover blade replacement?
Yes. The Maintenance section walks through checking and replacing the blade, greasing, and cleaning the mower deck, with the correct blade bolt torque. p. 49
Do I get instant access to this Kubota RCK60-30BB Workshop Manual?
Download starts immediately and gives you the complete 81-page searchable Workshop Manual. Open it on any device, from a laptop at your desk to a phone out in the field.
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