71 - 1
Section E
Hydraulics
9803/6410
Section E
71 - 1
Issue 1
Hydraulic Rams
Precautions During Use
1
Precautions when installing the ram on the machine
When installing and removing from the machine, suspend the ram safely.
Suspending the ram by the piping is not only dangerous, but can also cause damage to the cylinder.
Secure the piston rod with a band. It is very dangerous if the rod extends unexpectedly. Also, the rod can be damaged
and become unusable.
Welding after installing the ram may result in damage.
If electric welding is done even at a point away from the ram, there may be sparking inside the ram and it will become
necessary to replace the ram with a new one.
When painting the machine, mask the ram.
If paint adheres to the rod surface or to the wiper ring and the ram is operated, the wiper ring will not function properly
and foreign matter and paint can easily enter the ram. This will cause damage to the seals, drastically shortening the life
of the ram.
Install the ram only when it is clean.
2
Caution During Use
Use only under designated conditions.
If hydraulic oil other than the designated oil is used, the seals quickly degenerate and become damaged. If the relief valve
is set at a value higher than specified, it may cause ram damage and is dangerous.
In high temperature environments (approx. 90°C and above) or low temperature environments (below -20°C), seals
quickly become damaged. Special seal materials are necessary so check to see if the ram that you are using is suitable or
not.
The number one cause of ram oil leakage is rod damage. Be careful not to damage the rod.
Warm up sufficiently before beginning work.
In cold conditions the rod seals may be frozen, so if the ram is operated at maximum pressure and maximum speed, the
seals will be damaged.
There is a large amount of air in a new ram or one which has been left for a long time, so the ram will not operate
smoothly. Also, if pressure is applied suddenly without bleeding the air, high temperatures will be generated due to
adiabatic compression and the seals may burn.
Before beginning work, always move the ram at full stroke with no load and expel air from the cylinder.
When stopping or storing, do it at a safe and fixed position.
The installed ram cannot maintain the same position for a long period of time, because the oil inside the ram may leak
and the hydraulic oil volume decreases as it cools. Stop or store the machine in a safe and fixed position.
3
Maintenance, Inspection Points.
Carry out daily maintenance and inspection.
The key point for correct long-term ram function is daily maintenance and inspection. Carry out maintenance and
inspection so that the ram functions fully at all times. Always remove any mud, water, dust or oil film adhering to the rod
and keep it in normal condition. However, when cleaning the wiper ring and seals, do not get them wet with water but
wipe clean with a rag. If leaving for more than one week, apply anti-rust oil to the rod surface.
Use genuine JCB parts when replacing parts.
If parts other than genuine JCB parts are used, the desired results may not be obtained. Use only genuine JCB parts.
Caution during dismantling and reassembly.
Dismantling the ram while it is still installed on the machine can be dangerous as unexpected movements of the machine
can occur. Remove the ram from the machine and then dismantle.
If reassembled with dirty hands, foreign matter can enter the ram causing a shorter life span and also the other hydraulic
equipment may be damaged. Reassemble in a clean state.
Follow the instructions in the diagrams regarding torque tightening for screwed parts. If the torque is too high or too low,
it can cause damage.
Содержание JS130
Страница 39: ...3 3 Section 3 Routine Maintenance 9803 6410 Section 3 3 3 Issue 1 Greasing continued Excavator End...
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Страница 119: ...3 1 Section C Electrics 9803 6410 Section C 3 1 Issue 1 Layout Operator s Cab...
Страница 142: ...5 3 Section C Electrics 9803 6410 Section C 5 3 Issue 1 Pump Control FLOW CHART...
Страница 145: ...5 6 Section C Electrics 9803 6410 Section C 5 6 Issue 1 Pump Control Cushioned Boom Starting continued Flow Chart...
Страница 148: ...5 9 Section C Electrics 9803 6410 Section C 5 9 Issue 1 Pump Control Pressure Increasing System continued Flow Chart...
Страница 155: ...5 16 Section C Electrics 9803 6410 Section C 5 16 Issue 1 Pump Control Power Supply Cut Delay Flow Chart...
Страница 159: ...5 20 Section C Electrics 9803 6410 Section C 5 20 Issue 1 Pump Control Swing brake Swing lock continued Flow Chart...
Страница 160: ...5 21 Section C Electrics 9803 6410 Section C 5 21 Issue 1 Pump Control Lever Lock Circuit Diagram Time Chart...
Страница 161: ...5 22 Section C Electrics 9803 6410 Section C 5 22 Issue 1 Pump Control Lever Lock continued Flow Chart...
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Страница 210: ...3 4 Section E Hydraulics 9803 6410 Section E 3 4 Issue 2 Schematics Shuttle Block...
Страница 211: ...Section E Section E Hydraulics 9803 6410 Issue 2 3 5 3 5 Schematics Pilot Control Line Hose Connection Diagram JS03540...
Страница 212: ...Section E Section E Hydraulics 9803 6410 Issue 1 3 6 3 6 Schematics Pilot Control Line Hose Connection Diagram JS03540...
Страница 234: ...14 1 Section E Hydraulics 9803 6410 Section E 14 1 Issue 1 JS00010 Hydraulic Pump Regulator Dismantling and Assembly...
Страница 278: ...32 2 Hydraulic Circuit Diagram Section E Hydraulics 9803 6410 Section E 32 2 Issue 1 Control Valve JS01700...
Страница 279: ...33 1 Neutral Circuit Section E Hydraulics 9803 6410 Section E 33 1 Issue 1 Control Valve JS01610...
Страница 284: ...33 6 Boom Raise BM Operation Section E Hydraulics 9803 6410 Section E 33 6 Issue 1 Control Valve L...
Страница 287: ...33 9 Slew Operation SW Priority Circuit Section E Hydraulics 9803 6410 Section E 33 9 Issue 1 Control Valve JS01770...
Страница 293: ...Hydraulics 9803 6410 Issue 1 34 3 34 3 Section E Section E Control Valve JS01820 Dismantling and Assembly cont d...
Страница 532: ...Contents Page No Technical Data 1 1 i Engine 9803 6410 i Issue 1 Section K Section K...