When your power pack goes down, this 83-page handbook and parts manual (OEM #9800/9001) gives you the factory breakdown to fix it. Inside are complete exploded views of the chassis, in-depth hydraulic pump details, and step-by-step operating controls. Open it for maintenance schedules covering both the Honda petrol and Yanmar diesel engines, plus full component listings for heavy-duty hose sets and shuttle valves. Set your test pressure to exactly 90 bar and verify the flow rate hits 20 litres per minute before putting the unit back to work. Stop hunting part numbers on old forums. The bookmarked file opens instantly on your phone or tablet so you can find the right spec fast.
What's Inside This JCB Beaver Mk I, Mk II, MRS Manual
| System | Pages | Key Topics |
|---|---|---|
| Handbook and Parts Manual | 1 | Engines, Frame/Chassis, Pumps & Tanks, Valves, Gauges/Main Hyd Hoses, Engine Fitments |
| Parts Location Procedure | 2-3 | Machine Serial No., Engine Serial No., Gearbox Serial No., Torque Converter Serial No., Axle Serial No. |
| Portable Power Pack | 5-30 | Engines, Frame/Chassis (Battery), Pumps & Tanks (- Single, - Double, Drive Components), Valves (Valve Block) |
| Attachments | 31-33 | Shuttle Valve, Main Hose Set - Heavy Duty, Main Hose Set - Lightweight |
| Introduction | 35-45 | Safety Notices, About This Handbook, Safety Check List, The Beaver Hydraulic Power Pack, Identifying Your Machine |
| Operation | 46-57 | Before Operating the Machine, Engine Controls Petrol Engine Honda Gx 240, Engine Controls Diesel Engine Yanmar L60E, Before Starting the Engine, Operating in Low Temperatures |
| Maintenance | 58-78 | Regular Maintenance Schedules, Lubricants Health and Safety, Hydraulic Couplings, Cleaning the Machine, Hydraulic Circuit, Honda Gx 240 Petrol Engine, Yanmar L60E Diesel Engine |
| Specification | 79-81 | Beaver Hydraulic Powerpack |
| Warranty | 83 | Hoses and Couplings, Genuine Parts, JCB Hydraulic Fluid, JCB Gear Oil, Engines, Hydraulic Pumps |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Beaver Mk I, Mk II | ||
| Hydraulic pump replacement (Lamborghini type) | PP/6601, PP/6601A | p. 15 |
| Hydraulic pump replacement (Dowty type) | PP/1554 | p. 15 |
| All Models | ||
| Heavy duty hose replacement | 5048 | p. 32 |
| Lightweight hose replacement | 929/06201 | p. 33 |
| Hydraulic Flow Rate (Category C) | 0-20 Lit/Min | p. 81 |
| Normal Hose Length | 7 metres | p. 81 |
| Maximum Hose Length (0-40°C) | 25m | p. 81 |
| Engine Max Permissible Speed | 3600 revs/min | p. 45 |
| Beaver Mk II Diesel | ||
| Diesel Cetane Number (minimum) | 45 | p. 72 |
JCB Beaver Mk I, Mk II, MRS Common Problems This Manual Covers
The JCB Beaver engine cuts out abruptly after the hydraulic fluid level drops slightly p. 72
Check the hydraulic reservoir and verify the fluid level. Fill the tank to its maximum capacity of 4 Litres (1.09 Gal) as shown on page 72. Inspect the oil-alert switch connections. Test the machine to ensure the switch does not trigger prematurely.
Manual Section: MaintenanceBreaker lacks striking power and tool performance drops significantly under heavy load p. 76
Test the hydraulic circuit flow rate, which should be 20 litres/min for Category C models as detailed on page 76. Adjust the engine speed and verify the main relief valve setting. Inspect the trigger spool and striker piston for binding or excessive wear.
Manual Section: Hydraulic Circuit Engine Speed and Relief Valve AdjustmentEngine starts easily but hunts or dies completely when the breaker trigger is pulled p. 68
Inspect the air intake system and replace the clogged filter with air filter element replacement PP/7105 on page 68 for Honda engines. Verify the engine reaches the maximum permissible speed of 3600 revs/min outlined on page 45. Clean the fuel filter and bleed the lines.
Manual Section: Honda GX 240 Petrol Engine MaintenanceMain hydraulic lines leaking fluid near the couplings or showing exposed wire braid p. 32
Remove the damaged lines immediately. Install the heavy duty hose replacement 5048 referenced on page 32 or the lightweight hose replacement 929/06201 on page 33. Clean all couplings before connecting the new hoses to prevent dirt from entering the hydraulic circuit.
Manual Section: AttachmentsFrequently Asked Questions
What are the replacement part numbers for the main hydraulic pump?
For the main hydraulic pump, see the 'Pump, Main Hydraulic & Components' section. Machines up to serial M607392 use pump PP/6601 (Lamborghini); later machines use PP/6601A. A Dowty pump, PP/1554, is also fitted on some units. Always check the type of pump fitted and use JCB Genuine Parts.
Why does the JCB Beaver engine cut out suddenly?
If the JCB Beaver cuts out abruptly, check the hydraulic reservoir and top it up to its 4 Litre (1.09 Gal) capacity as shown on page 72. Inspect the oil-alert switch connections so it does not trigger prematurely, then test the unit.
Why is the breaker losing striking power?
If the breaker lacks striking power, test the hydraulic circuit flow rate, which should be 20 litres/min for Category C models as detailed on page 76. Verify the main relief valve setting and inspect the trigger spool and striker piston for binding or excessive wear.
Why does the engine stall when I pull the breaker trigger?
If the engine hunts or dies when the trigger is pulled, replace the clogged Honda air filter element (PP/7105, page 68) and confirm the engine reaches its 3600 revs/min maximum (page 45). Clean the fuel filter and bleed the lines.
How do I replace leaking hydraulic hoses on the Beaver?
Replace leaking main hydraulic lines straight away. Fit the heavy duty hose 5048 (page 32) or the lightweight hose 929/06201 (page 33), and clean every coupling before connecting so dirt cannot enter the hydraulic circuit.
What do I get after purchasing this JCB Beaver manual?
A handbook and parts manual in searchable PDF format, available the moment you complete checkout. View it on a computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this manual?
Yes. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This is a scanned document, not a native digital PDF. You can search the full text and copy content due to an underlying OCR layer, which is generally accurate. The text quality is good and readable, though some pages show minor fading typical of scanned originals. Diagrams and illustrations are scanned images, appearing clear but will pixelate if zoomed significantly; their labels remain readable. Page condition is clean overall, with minimal scan artifacts or marks, and no notable blank pages.
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