jcb JS300 Service Manual page 682
Tracked excavators - tier 4i isuzu engine
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Also See for JS300:
- Service manual (51 pages) ,
- Service manual (51 pages) ,
- Operator's manual (31 pages)
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Main Control Valve
Type
Operating System
Main Relief Pressure:
Standard
Pressure Raising
Overload Relief Pressure:
Bucket open/close
Dipper
Boom Raising
Boom Lowering Pressure
Aux
Function
Dry weight
Type
Operating System
Main Relief Pressure
Standard
Pressure Raising
Overload Relief Pressure
Bucket Open/closed
Dipper
Boom Raising
Boom Lowering Pressure
Aux
TAB
Function
E-21
Table 11. JS300
Hydraulic Pilot System
Set pressure relief
343 bar (5685 lb/in
2
) at 138 litre/min (30.3 UK gal)
373 bar (5410 lb/in
2
) at 114 litre/min (25 UK gal)
392 bar (5685 lb/in
2
) at 20 litre/min (4.4 UK gal)
392 bar (5685 lb/in
2
) at 20 litre/min (4.4 UK gal)
392 bar (5685 lb/in
2
) at 20 litre/min (4.4 UK gal)
264 bar (3828 lb/in
2
) at 20 litre/min (4.4 UK gal)
2
314 bar (4554 lb/in
) at 20 litre/min (4.4 UK gal)
Travel priority, Slew priority, Boom and Dipper holding valves, Boom and Dipper
2-Speed internal confluence
286 kg (631 lb)
Table 12. JS330, JS370
Hydraulic Pilot System
Set pressure relief
319 bar (4626 lb/in
) at 240 l/min (53 gal)
2
348 bar (5047 lb/in
) at 220 l/min (48 gal)
2
363 bar (5264 lb/in
) at 20 l/min (4.4 gal)
2
363 bar (5264 lb/in
) at 20 l/min (4.4 gal)
2
363 bar (5264 lb/in
) at 20 l/min (4.4 gal)
2
245 bar (3553 lb/in
) at 20 l/min (4.4 gal)
2
300 bar (4351 lb/in
) at 20 l/min (4.4 gal)
2
363 bar (5264 lb/in
) at 20 l/min (4.4 gal)
2
Travel priority, Swing priority, Boom and Dipper holding valves, Boom and
Dipper 2-Speed internal confluence
9813/5100-1
Section E - Hydraulics
Hydraulic System
Specifications
E-21
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