PAGE 18 323 REV.030624
FAILURE
PROBABLE CAUSE
Free fall cannot be controlled.
a) Emergency free fall is non-controllable.
b) Piping circuit or control valve is incorrect. Check hydraulic
circuit.
c) Control valve used has poor metering characteristics. The
control valve should have a flow capacity of 3 - 6 gpm
maximum. If a large volume control valve is used, it may
not provide good metering of the hydraulic oil, resulting in
poor speed control.
d) Hydraulic metering pump, installed in the end housing, is
damaged.
a) Oil leaks from the motor flange are caused by a damaged
O-ring seal on the motor flange.
b) Oil leaks occurring between cable drum flanges and
housings are caused by excessive pressure in free fall
housing or brake housing. If pressure in free fall end
exceeds 10 psi (0.7 bar) check for restrictions in free fall
circulation return line. If pressure in brake housing exceeds
30 psi (2 bar) check for damage to oil seal, item 607, and
restrictions in brake circulation return line. Both circulation
return lines must go directly back to reservoir.
c)
Oil leaking out of the free fall housing on either side of the
spring retainer is caused by a damaged O-ring seal, item 213.
TROUBLESHOOTING CONTINUED
Oil leaks.
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