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7.6.3 Coil replacement
A defective control solenoid coil may only be replaced with the manufacturer's original replacement coil with identical parameters.
› Switch off the pressure source (pump) of the hydraulic circuit (see also 7.5).
› Switch off the pressure source (pump) of the hydraulic circuit (see also 7.5).
› Relieve the hydraulic circuit including the accumulators by connecting it to the tank (see also 7.5).
› Make sure that the hydraulic circuit is de-pressurized (see also 7.5).
› Switch off the electrical supply to the valve solenoids (see also 7.5)..
› Ensure that the surface of the valve and solenoid coils is cooled to a low enough temperature to prevent skin burns (see also 7.5).
› Clean the surface and surroundings of the valve.
› Disconnect the coil surface ground wire.
› Disconnect the coil cable from the power supply.
› Loosen the coil fastening nut by turning it anti-clockwise using the wrench a = 36. Remove the nut.
› Remove the sealing ring (1) 21.89x2.62, the coil and the second sealing ring 22x1.5 from the control system tube.
› Check the surface condition of the control system for damage, e.g. corrosion.
› Connect the power supply cable to the new coil according to point 7.2.1, unless a coil with an already connected cable has been supplied by the
manufacturer. We recommend using a new cable to connect the new coil. Replace the sealing rings with new ones. They are supplied in a set with
the coil and a new fastening nut.
› Replace the coil sealing rings with new ones. They are supplied in a set with the coil and a new clamping nut.
› Fit a new 22x1.5 sealing ring, a new coil with attached cable, a new 21.89 x 2.62 sealing ring and screw on a new clamping nut on the control
system tube. Tighten the nut with a wrench to a torque of 5 + 1 Nm.
› Connect the ground wire to the new coil.
› After completing the coil replacement, check the valve for proper operation.
7.7 Product maintenance
During normal operation, keep the valve clean and free of dust deposits on the surface. Deposits both impair cooling of the valve and coils and can
form flammable layers prone to ignition. Depending on the conditions of use, check the hydraulic circuit for leaks, the electrical parts including cables
for damage and the valve for correct function at appropriate intervals. The check should be performed every time the device is started, but at least
once a week during long-term operation.
7.8 Spare parts supplied
Ordered as spare sparts, see catalog SP 8010.
Item
Description of spare part
1
Valve coil
2
Sealing ring OS - coil
3
Seal under the nut
4
Coil mounting nut
5
Terminal lid seal
6
Fastening nut with emergency control M7
*All coils are supplied complete with mounting nut (4) and sealing rings (2 and 3).
2
Page 18
Hydraulic block
Control system
Sealing ring (2)
22x1.5
1
5
1
Coil
Sealing ring (1)
21.89x2.62
Designation
See coil overview
O-ring 22x1.5 VMQ 50 (silicon)
O-ring 21.89x2.62 VMQ 70 (silicon)
O-ring 46x2 VMQ (silicon)
3
6
4
Mounting nut
Order number
See coil overview*
in set with coil
in set with coil
in set with coil
34950700
33050700
www.argo-hytos.com
Instructions_SD3EX-C2*S5(S6)_14091_1en_01/2023
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