Argo-Hytos RPEX3-06, Operating Instructions Manual

Page: 18 / 38

Subject to change_RPEX3-06_14054_1en_03/2022
Page 18
www.argo-hytos.com
› Check that the coil cables in the grommet and the earth wires are properly secured to ensure that they are not loose when the valve is handled.
› After the repair, verify the new seals are tight and the valve is working properly
7.6.3 Replacing the coil
A defective control solenoid coil may only be replaced with the manufacturer‘s original replacement coil with identical parameters.
› Ensure that no explosive atmosphere is present during the repair (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 pressure-free (see also 7.5).
› Switch off the electrical supply to the directional control 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 directional control valve.
› Disconnect the coil cable from the power supply.
› Disconnect the coil surface ground wire.
› 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.
› Put a new 22x1.5 sealing ring on the pipe, a new coil with attached cable, a new 21.89 x 2.62 sealing ring and screw on a new fastening
nut. Tighten the nut with a wrench to a torque of 5 + 1 Nm.
› Connect the ground wire to the new coil.
› Connect the coil cable to the power supply.
Valve body Control system
Coil
Fastening nut
Sealing ring (1)
21.89x2.62 Sealing ring (2)
22x1.5
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 operation 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 parts: see catalog SP 8010
Item Description of spare part Designation Order number
1 Seal set 4x Square ring 9,25x1,68 NBR set 15845200
2 Valve mounting screws 4x M5x45 DIN 912 8.9 set 15845100
3 Directional control valve coil See coil overview see coil overview*
4 Sealing ring OS - coil O-ring 22x1,5 VMQ 50 (silicon) in set with coil
5 Seal under the nut O-ring 21,89x2,62 VMQ 70 (silicon) in set with coil
6 Terminal box lid seal O-ring 46x2 VMQ (silicon) 34950700
7 Coil fastening nut in set with coil
8 Fastening nut with emergency control N7 33050700
*All coils are supplied complete with fastening nut (7) and sealing rings (4 and 5).
1
1
2
3 3
4
5 6
7
8