Adjusting The Spring-Loaded Pulley; Maintenance - EFA Z28 Betriebsanleitung

4.5 Adjusting the spring-loaded pul-
ley
The spring-loaded pulley can be adjusted by turning
the PLUS/MINUS screw at the housing (see figure 1)
Figure 1: Spring-loaded pulley
Turn the screw in MINUS direction until the tool
is balanced and suspended at the correct
height.
The switching levers are pressed,
but the pump and/or the cutter
are not working
When the switching levers are
pressed, the pump is started, but
the cutter remains open
When the switching levers are
pressed, the pump is started, but
the cutter closes only very slowly
Hydraulic pump is overheating
Pump is running, but there is no
pressure at the cutter
Handle cannot be pressed
Schmid & Wezel
D 75433 Maulbronn
If it is not possible to pull more cable from the
pulley, it is jammed and must be readjusted.
Turn the screw in PLUS direction until cable can
be pulled from the pulley and repeat the fine
adjustment (see above).

5. Maintenance

Malfunctions that might occur during operation can
generally be eliminated very simply. The most
common malfunctions, their causes and remedies
are compiled in Table 1: "Troubleshooting".
Table 1: Troubleshooting
1. Unit is not switched on
2. No power
3. Insufficient air pressure
4. Control line defective
5. Two-hand safety block
defective
6. Coupling adapter of the
hydraulic return hose not
properly connected
7. Seals defective
8. Hydraulic fluid level too low
9. Fluid filter of pump blocked
10. Hose coupling loose
11. Gear pump defective
12. Seals in the hydraulic pump
cylinder are defective
13. Valve defective
14. Valve blocked by dirt
Seite/ Page
7/ 9
Switch on hydraulic unit
Check power supply and repair
Adjust air pressure at the unit to
minimum 5 bar (for hose length 5
m)
Check control line and replace, if
necessary
Inspect two-hand safety block
and replace, if necessary
Check and reconnect hose
Check seals and replace, if
necessary
Refill hydraulic fluid (see chapter
3.1.2 "Hydraulic unit" (page 3))
Replace filter and fluid
Inspect couplings and hose
connections
Replace gear pump
Replace seals; if necessary,
replace pump cylinder
Replace valve (see chapter 4.2
"Replacement of valve" (page 4))
Clean valve (see chapter 4.2
"Replacement of valve" (page 4))
Ausführung/ Version
2014