Assembly; Replacement Of Blade; Replacement Of Valve; Replacement Of Piston - EFA Z079 Betriebsanleitung

4. Assembly

Before carrying out any assembly
work, disconnect the cutter from
the power supply!
For correct assembly, please refer to the drawings
in Appendix A.4 "Explosion View of Z079" (page
15) and Appendix A.5 "Explosion View of Z080"
(page 15).

4.1 Replacement of blade

4.1.1 Removing blade
Close cutter so that the blades (15) touch.
Switch off the hydraulic unit and press the
valve lever (27) once to release all pressure
from the system.
Disconnect cutter (see chapter 3.1.3
"Connecting and disconnecting of cutter" (page
4)).
Remove lock washers (4a) and push out both
bolts (16) with pin (144). Ensure that the fork
is properly aligned.
Remove hexagon nut (19) and stud bolt (18).
Prior to reassembling the cutter, clean all parts,
inspect for wear and replace, if necessary. Apply
EFA special grease (136) to all sliding surfaces.
4.1.2 Inspection of blade play
In order to prevent breakage, the blades must be
adjusted so that they move easily without
excessive play. Adjust the clearance with the
hexagon nut (19).
4.1.3 Mounting of blades
Prior to reassembling the cutter, clean all parts,
inspect for wear and replace, if necessary. Apply
EFA special grease (136) to all sliding surfaces.
Prior to securing the forks (3). adjust the
clearance of the blades (15) with the self-locking
hexagon nuts (19).

4.2 Replacement of valve

4.2.1 Replacement of valve parts
Dismantle the straight pin (28) and the valve
lever (27).
Remove the circlip (26), shim (25), valve bolt
(23) and pressure spring (22).
Schmid & Wezel
D75433 Maulbronn,
Clean the parts, inspect for wear and assemble
unit by following the above instructions in
reverse order.
The valve casing is shrink-fitted into the housing
and cannot be replaced.

4.3 Replacement of piston

4.3.1 Replacement of piston parts
For repairs, you need a specially devised assembly
kit. For details, please refer to Appendix A "List of
Spare Parts and Wear Parts" (page 13).
Dismantle the blades (15) (see chapter 4.1.1
"Removing blade" (page 6)).
Loosen the threaded ring (8), using the hook
spanner (140) (right-hand thread).
Remove the housing (1) and push the piston
rod (2) together with the piston (11) in the
direction of the guide.
Position both forks (3) diagonally and remove
piston (11) using the face spanner (141). The
piston (11) is secured with Loctite. To remove
it, heat it to 150 °C
Inspect ring (14) for wear. It can only be
removed by breaking it.
The guide tube is screwed into the housing (1)
and secured with Loctite. To dismantle it must
be heated to 150 C.
Clean all parts, inspect for wear and assemble
unit by following the above instructions in
reverse order.
Apply EFA special grease (136) to all sliding
surfaces and the blades (15).
CAUTION:
The piston (11) must be secured with Loctite 542!
To mount the ring (14), always use the
assembly cone (145) and the expansion sleeve
(146).
Keep a clearance of 1 mm between the cutter
body (5) and the treaded ring (8).

4.4 Hydraulic unit

At least once every year, drain off the fluid,
inspect it for contamination and replace it, if
necessary. (For detailed instructions, see also the
separate operating manual of the hydraulic unit).