Cincinnati 175 CB - Troubleshooting and Checklists

MACHINE LEVELNESS
The machine levelness should be checked every three
months and adjusted if necessary. See Section 1
INSTALLATION for details of this adjustment.
SWIVEL END-GUIDE BEARINGS
To adjust for wear in the swivel end-guide bearings, loosen
the locking screws. Adjust ram shoe clamp by tightening
the
adjusting screws evenly until they are snug. Back-off
slightly to obtain a clearance of .003" between guide and
swivel end guide bearing. Tighten the locknuts. See
Figure 46.
ELECTRICAL
The logic control is a printed circuit board designed for
long life. If for any reason there is a problem in this
board, it should be replaced as a unit.
A logic diagram and board layout drawing is included with
this manual for reference.
FIGURE 46
TROUBLESHOOTING
Effective troubleshooting is usually acquired with experience and by a thorough knowledge of your
machine and its operation. The assembly drawings~ including hydraulic and electrical schematics
included with this manual should be used as troubleshooting aids. The following chart has been
developed to present typical effects which indicate trouble spots in the machine system.
TROUBLE
A. Pump motor will not
start.
B. Upon reaching the top
stop position the pump
motor stops (top drift
failure) .
C.
Ram drifts downward
rapidly when in idle
resulting in a "tilt"
condition. (Motor
shuts off).
D. Ram will only run in
"FAST" down speed and
will not return to the
top.
PROBABLE CAUSE
1. Ram has tilted beyond limits
contacting lLS or 2LS.
2. Blown fuse
440V - FU 1, 2 & 3
110V - FU 4
Power supply - FU 5 & 6
3. Motor heaters.
1. Piston seals leaking.
2. Faulty counterbalance valve.
1. Counterbalance setting too low.
2. Faulty counterbalance valve.
3. Piston seals leaking.
1. SVI solenoid valve remains in
center position.
WHAT TO DO
1. Re-level ram, Section 6 -
if condition repeats see C,
K, L or Q below.
2. Replace fuse - if fuse con-
tinues to blow, check for
unwanted grounds or shorts.
3. Reset heaters - if heaters
continue to kick out, check
motor for abnormal loading.
1. Replace seals - Section 6.
2. Repair or replace.
1. Reset counterbalance pressure
- Section 6
2. Repair or replace.
3. Replace seals - Section 6.
1.1 Check electrical connections
and signal.
1.2 Shift valve with manual over-
ride several times. Repair
or replace valve if problem
continues.
E. Ram will only run in
"LOW
tt
speed (up and down).
1. SV2 solenoid valve remains in
center position.
28
1.
Same as D.