WDS_Automation_Catalogue

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SECTION 21 - SPENCER FRANKLIN HYDRACLAMP, HYDRAULICS
AND PNEUMATICS WDS
WDS
21-47 & 0845 606 66 77 • : • *
Do not use the booster or cylinder return springs as dead stops.
Take care not to subject the linear cylinders to any significant side loading as this can damage the
seals.
Always use bonded self-centering washers when sealing parallel B.S.P. threads.
For general clamping applications ¼” bore hoses and ¼” B.S.P. air valves are suitable. For maximum
speed of operation, i.e. on presswork use 3/8” or ½”bore pipework and air valves. The shorter the
flexible hose the less the expansion losses.
Whilst the booster will operate effectively when sited below the cylinders, the bleeding of the system
and maintenance are much easier if the booster is placed at the highest point in the system. The use
of the self-bleed reservoir SF- 4957 will make air removal easier.
The bleeding of a PowRlock circuit is exactly the same principle as the automobile hydraulic braking
systems, except normally the automobile is on level ground and it is recommended to commence
bleeding from the farthest point of the hydraulic energy source. The PowRlock system is simpler in
effect as it is recommended to bleed from the highest point of the circuit and if it also be the hydraulic
energy source (i.e. Booster, Lever or hand pump) so much the better.
If the circuit to be bled is an existing one and has air bubbles entrained, consider at this point the
necessity for seal and fluid renewal.
Slacken off connectors (finger tight) and introduce fluid at the highest port connection, filler plug or
hose, which shall be referred to as the ‘high point’ for convenience.
Starting from the lowest point, slacken connection to allow a flow of oil to escape from the system
(wasted fluid should be prevented from contaminating floors by using a drip tray). When flow becomes
continuous and free from air bubbles – tighten the connection, top up the system with fluid at the high
point – continuously during bleeding. Repeat the procedure at every clamping head or ram working
upwards towards the high point.
Should the high point be in the middle of the circuit, start as above from one end working upwards to
the high point and then repeat from the other end of the circuit. Having secured all connections
(including the high point), cycle the unit several times and then switch it off. Remove the high point
connection and top up with fluid if necessary, repeat until the system is fully primed.
On presswork applications the use of a booster reservoir assembly SF - 4957 will greatly assist in the
bleeding of the circuit and prove most useful as a permanent feature of the hydraulic circuit. If in doubt
please contact WDS, who would be pleased to advise you.
Bleeding the Hydraulic System
Recommended Hydraulic Oil
WDS SF –8M99000 (1/2 Litre) SF – 8M99001 (1 Litre)
Oil Grade SAE 10w HYDRAULIC
System Design