HYDAC SK 600 - Manual (Page 5)

Maintenance
INNOVATIVE FLUID POWER 53
PN#02068195 / 04.13 / ACU1102-1326
8.2. Piston Accumulator
with Protruding Piston Rod
8.2.1 Disconnection, Disassembly, Testing
and Cleaning
Disconnect the piston accumulator as described in section 8.1.
8.2.2 Assembly
a) Fitting the piston seals
Fit the piston seals as described in point 8.1.4 a)
b) Assemble the piston accumulator
• Fit piston rod into the piston base.
• Lubricate the upper part of the cylinder wall and the guide ends
of the piston with a suitable lubricant (filtered operating fluid) . Do
not use grease or water - water is not a lubricant!
• Place mounting sleeve (see section 9 - Special tools and spare parts)
onto the cylindrical tube.
• With the hollow side towards the gas connection, insert the
piston fully into the tube. A plastic or wooden rod or a rubber
mallet can be used for this purpose.
• Grease both O-rings and the threads on the end caps.
• Screw in both end caps, or end caps with threaded ring, into the
cylindrical tube, if necessary with the aid of the two bolts and a
rod, until they are level with the ends of the accumulator.
• If specified, the accumulator must be filled on the gas side with
the designated quantity of oil.
• Fit the gas valve and all adapters and other accessories.
• Push the guide block, fitted with an O–ring, over the piston rod
and screw it firmly to the end cap.
• Fit the rubber packing seal kit in the groove provided.
• Place the sealing flange with the skimmer in position and
screw on.
• Connect HYDAC Charging and Testing Unit FPU–1 and charge
the accumulator according to the instructions (see section 6.2)
with the required pre–charge pressure.
• On piston accumulators with the gas valve version 1, the internal.
hex. screw must be tightened with a torque rating of 20 Nm
and with version 4, the valve seal cap must be tightened with a
torque rating of 30 Nm.
• Screw on valve protection cap.
c) Fitting the accumulator into the system
Reconnect the piston accumulator to the system and check for leaks
according to section 6 - Inspection and Maintenance.
8.3. Piston Accumulator with Electrical
Limit Switch
For item numbers, see section 9.2.3.
8.3.1 Disconnection, Disassembly, Testing
and Cleaning
Disconnect the piston accumulator as described in section 8.1.
8.3.2 Assembly
a) Fitting the piston seals
Fit the piston seals as described in section 8.1.4 a)
b) Assemble the piston accumulator
• Lubricate the upper part of the cylinder wall and the guide ends
of the piston with a suitable lubricant (filtered operating fluid) . Do
not use grease or water - water is not a lubricant!
• Place mounting sleeve (see section 9 - Special tools and spare parts)
onto the cylindrical tube.
• With the hollow end towards the gas connection, insert the
piston fully into the tube. A plastic or wooden rod or a rubber
mallet can be used for this purpose.
• Grease both O–rings and the threads on the end caps.
• Fit the limit switch with the O–ring in place.
• Screw in both end caps, or end caps with threaded ring, into the
cylindrical tube, if necessary with the aid of the two bolts and a
rod, until they are level with the ends of the accumulator.
• If specified, the accumulator must be filled on the gas side with
the designated quantity of oil.
• Fit the gas valve and all adapters and other accessories.
• Connect HYDAC Charging and Testing Unit FPU–1 and charge
the accumulator according to the instructions (see section 6.2) with
the required precharge pressure.
• On piston accumulators with the gas valve version 1, the internal.
hex. screw must be tightened with a torque rating of 20 Nm
and with version 4, the valve seal cap must be tightened with a
torque rating of 30 Nm.
• Screw on valve protection cap.
c) Fitting the accumulator into the system
Reconnect the piston accumulator to the system and check for leaks
according to section 6 - Inspection and Maintenance.