FRD-FURUKAWA F-Series Hydraulic Breakers
Development Target
1. Durability & reliability. 2. Increase blow power. 3. Reduce maintenance cost. 4. Multi-function valve to meet market demand. 5. Newly designed box frame. 6. Introduce series of product to fit series of excavator sizes.
Sales features
1. Clean air-intake system extends piston and bushing life. 2. Lubrication for upper and lower bushings. 3. Relief valve to maintain system pressure. 4. Anti-idle blow valve. 5. Front and side mounted hose fitting ports. 6. Tunnel conversion ease.
Series Construction
1. Mini – Series･････････････ F1.2.3.4.5 2. Mid - Size Series･････････ F6. 9 3. Conventional Series ･･････ F11.20.30.70 4. Multi - Function Series ･･･ F12.19.22.27.35.45
Mini Series (F1-F5) Accumulator
Nitrogen Gas Back-head
Oil port Control valve
Cylinder
Through bolt Piston Front-head
Rod pin
Front bushing Rod
Mid-Size Series(F6 & F9) Charge valve
Through-bolt
Control valve
Nitrogen gas
Oil port Accumulator Nitrogen gas Front-head
Back-head
Cylinder
Piston Thrust ring Thrust bushing
Front bushing
Rod
Rod-pin
Conventional Series (F11、F20、F30、F70) Oil ports
Through bolt Nitrogen gas
Charge valve Control valve Accumulator Nitrogen gas Front-head Grease fitting
Rod
Back-head Cylinder Piston Thrust ring Thrust bushing Rod pin Front-cover
Multi-Function Series (F12 - F45) Air intake Oil ports Charge valve
Control valve Accumulator Nitrogen gas Thrust ring Thrust bushing
Through bolt Nitrogen gas Back-head Cylinder Piston
Front head Rod pin
Front cover Rod
Functions 1. Through bolt 2. Cylinder 3. Accumulator 4. Piston 5. Front-head 6. Front cover/bushing 7. Rod 8. Control valve 9. Stroke adjuster 10. Valve adjuster 11. Safety valve 12. Back-head
Through-bolt Retains back-head, cylinder and front-head together. All the threads are die-rolled to maintain material flow. Through-bolt Back-head
Through-bolt
Back-head
Cylinder
Cylinder
Front-head
Front-head
F1 – F5
F6 – F70 When one through bolt is failed, replace diagonally opposed throughbolt also. To re-torque through-bolts, loosen four of them to ½ turn, and re-torque them to the specification.
Cylinder The largest single part of the breaker. It is machined, then heat-treated and polished to the specification. F1 – F5
F6 & F9
F11 - F70
Accumulator Reserves pressure oil and absolves pressure spike when piston is at top dead center and bottom dead center. It is Nitrogen filled. F11and up,diaphragms can be replace with hand tools.
Diaphragm
Accumulator
Cylinder Back-head F1 – F5
Screw-on Needs die
Bolt-on
When diaphragm is damaged, inlet hose will vibrates and brake power will be decreased.
Piston Transmits dynamic power toward the rod and rod will break object rock. Surface of the piston is super finished. Not chrome plated. F1 – F5
Rod
Piston
F6 – F70
F1 – F5
F6 – F70 Rod
Piston
Surface of the piston is only protected by the oil film from rusting.
Front-Head-1 Front-head is installed with thrust bushing and front-bushing. They hold rod in-line to the piston. F1 – F5
Front-Head
F6, F9
Grease fitting
Grease fitting
Thrust bushing Front bushing
Front-Head-2 Front-head is installed 3 wear bushings named thrust ring, thrust bushing and front-cover. They hold the rod in-line to the piston. next page
F12, F19, F22, F27, 35, F45, F70 Air check valve
Thrust ring Thrust bushing
F11, F20, F30
Front-Cover/Bushing Front-Cover/Bushing holds rod and it is exposed to the dusty condition. Grease lubrication is a key for maintenance. F1 - F5 ： 4mm F6 ・ F9 ： 6mm Clearance
Front-Bushing For F11 and larger breakers, front-cover is provided with wear indicating recess. Advise operator to replace front cover before recess is wear out. Use of worn front cover can damage rod head or piston striking face . F11 - F27 : 3.5 mm F30 - F70 : 4.5 mm Thrust bushing
Front-Cover
Thrust ring
.
Front cover
Front-head
Rod Four different kind of rods are available for different rock conditions.
Rod Flat(blunt)rod Flat tip design rod, common for shot rock breaking. Used for hard but cracked rock. Rod breaks rock with shock wave. Because of flat face, rod will not slip during breaking.
Moil point / corn rod Conical tip is named corn rod and square dipyramid is named moil point rod. Commonly used for breaking of concrete, rock layers, hard foundation and road construction. Sharp point can penetrate well against the rock with wedge effect.
Rod Wedge point Chisel design tip is named wedge point.. Wedge effect of the tip will penetrate into the object rock. Good for trenching, breaking of layered rock. It is not recommended to use for hard rock.
Core rod Fitted hard alloy steel bar in the moil point rod. This rod is only recommended for abrasive rock.
Control Valve F1 – F5 : Control valve is directly mounted on the piston. F6 & F9 : Control valve is built in the cylinder. F1 - F5
F6 , F9 Control valve
Cylinder
Piston
Multi-Function Control Valve F12, F19, F22, F27, F35, F45
Remote grease port Valve adjuster
Stroke adjuster
Safety valve
Stroke Adjuster Available for F11 and larger Adjusts piston stroke. LONG stroke or SHORT stroke. LONG stroke: less number of blows. 100% blows. SHORT stroke: more number of blows. 150% blows but 70% force of LONG stroke For hard rock use LONG stroke. For soft or cracked rock, use SHORT stroke.
Choice of AUTOMATIC STOP valve. Named “Anti idle blow” Quit blows when rock is broke. To restart simply press the rod against the rock. *Only active at LONG stroke position.
Stroke Valve Constant Blow
Stroke valve Automatic Stop
Stroke Adjuster
Number of blows
Stroke Adjuster
Screw Position Number of rotations from the fully screwed in position.
Valve Adjuster & Safety valve Valve Adjuster (Factory preset, no adjustment required) Open : To increase number of blows and decrease operating pressure. Close : To reduce number of blows and raise operating pressure.
Open
Adjuster
Close
Valve Adjuster & Safety valve Safety Valve Control maximum operating pressure at 21MPa. Valve is not re-adjustable. Replace spring, needle and sheet if operating pressure becomes low.
spring needle sheet
Back-Head F1 – F5: Nitrogen gas is not charged. F6 – F9: Nitrogen gas is charged. Compressed nitrogen gas increases piston down speed.
F1 - F5
F6, F9 Accumulator
Back-head Charge valve
Back-head
Back-Head Back-Head F12, F19, F22, F27, F35, F45, F70 Increase gas press. : Increase impact power and decrease number of blows. Decrease gas press. : Decrease impact power and increase number of blows. 2 x 2 Oil port
Back-head
Back-head
F11、F20、F30
Air cap
Hi pressure IN
Hi pressure IN
Charge valve Charge valve Swivel adopter
Nitrogen gas can leak. When impact power is decreased, measure nitrogen gas pressure.
Rock Professional
