Cincinnati 175 CB - Page 31

TROUBLE
PROBABLE CAUSE
WHAT TO DO
F. Ram speeds are lower than 1. Worn pump section(s).
normal.
1. Overhaul or replace.
G. Ram stalls during bend 1. Main relief pressure set too low.
and will not reverse or
reach maximum capacity.
2. Worn pump section(s).
1. Reset main relief pressure
- Section 6
2. Replace pump cartridge(s).
H. Ram stalls during bend
and will not reverse,
but does reach maxiumum
capacity.
1. Solenoid valve SVl remains
in the "Btl position.
2. Solenoid valve SV2 remains
in the "An position.
1. Check electrical connections
and signal to valve(s) and
pressure switches.
2. Shift valve(s) with manual
override several times.
Repair or replace valve if
problem continues.
I. Ram reverses before
building up proper
tonnage or completing
the bend.
1. Defective pressure switch(s)
(lPS or 2PS)
2. Defective tonnage control
pressure transducer.
1. Isolate defective component
& by alternately disconnecting
2. from circuit and replace.
3. Bottom stop set too high.
3. Lower bottom stop.
J. Tonnage reaches maximum
capacity but the ram
reverses before
completing the bend.
1. Attempting to make "over"
capacity bends.
1.1 Tensile and yield of part
are too high.
1.2 Improper dies for material
and/or bend.
Overhaul or replace.
Replace seal - Section 6.
Center the load and see
Section 5 of this manual.
Check tape, protective tube
and sheaves for damage and
free movement.
2.
Load not
centered
left-to-
2.
right on
machine.
1. Piston seal
leaking.
1.
2.
Internal
leakage
in flow
divider.
2.
1. Leveling tape.
1.
L. Erratic leveling of the
ram - inconsistent from
bend to bend.
K. Ram goes out-af-level
during bend and shuts
off drive motor.
2. Servo valve.
2. Remove and inspect servo
valve - clean or replace.
3. Flow divider.
:3. Overhaul or replace.
M. On return stroke the ram
continues up past the
top stop and pistons top
out in cylinders.
1. Top stop limit switch 3LS.
1. Check electrical connections
and signal. Adjust limit
switch cam arm. Replace
defective switch.
2. Solenoid valve SVI remains
in the "A
lt
position.
2. Shift valve with manual over-
ride several times. Repair
or replace valve if problem
continues.
Same as M.
Same as M.
Check all selector switch and
stroke control cam settings.
Check electrical connections
and signal. Check actuators -
repair or replace.
N. On down stroke ram
will
1.
Speed change
limit switch 4LS.
1.
not shift speeds.
2. Solenoid valve SV1 remains
2.
in the
nA
ft
position.
o.
With pump drive motor
1. Improper selector switch(s)
1.
running,
ram will not
or stroke control cam settings.
cycle.
2. Footswitch or palmbutton.
2.
P. Ram will not reverse on
bottom limit switch but
continues downward re-
versing on tonnage.
1. Bottom stop limit switch 5LS. 1. Check electrical connections
and signal. Replace defective
switch.
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