Cincinnati 175 CB - Tilt Limit Switches

7. Repeat Steps 4, 5 and 6 until both ends of machine
have the same indicator reading at the ram reversal
point.
8. If necessary, replace the tilt adjusting ~nob graduated
decal aligning its zero position. Also adjust the tilt
pointer to its zero position.
REPLACING THE LEVELING BAND:
1. Block the ram so it is parallel to bed.
2. Turn OFF all power to the machine and lock the
electrical disconnect.
3. Remove the old leveling band and cut the new band to
the same length as the old one.
4. A ttach the new leveling band to the anchor point on
the adjusting knob screw.
5. Pass the leveling band over the sheaves and through
the protective tube on the rear of the ram.
6. A ttach the left end of the leveling band to the servo
valve anchor, pulling the band as tight as possible.
7. Tighten the band by turning the tilt adjusting knob
(clockwise) until .040" clearance is provided between
the servo valve anchor collar and the bottom of the
servo valve mounting block. This is the zero point or
neutral position for the servo valve.
8. The tilt adjusting knob screw should be recessed
approximately 5/S
n
(+1/8") from the end of the knob
when the servo valve is in the neutral position.
Repeat Steps 6 and 7 until this dimension is obtained.
9. Check the level of the bed and ram per the previous
instructions.
REPLACING SERVO VALVE:
1. Block ram at both ends. Turn OFF all power· to
machine and LOCK disconnect s\Yitch on main electrical
enclosure.
2. Remove cover and old servo valve from servo valve
housing.
3. Place. 040" feeler gage between servo valve anchor
collar and servo valve housing.
4. Install locknuts on servo valve stem located at bottom
of servo valve. Bolt new servo valve in place.
5. Adjust position of valve spool with adjusting nuts to
obtain .188
tt
±.005" dimension. See Figure 45.
6. Check parallelism of bed and ram as previously
described. Adjust if necessary to obtain parallelism.
7. Replace servo valve cover.
RELEVELING THE RAM:
Should the ram go out-of-level far enough to actuate the
out-of-Ievel limit switch, it must be releveled mechanically.
..---------IMPORTANT---------
The Tilt Limit Switches ·must not be bypassed
or readjusted to restore electrical circuits. If
machine is operated with excessive tilt, the
slides and guides may be damaged.
27
SERVO VALVE
ADJUSTING NUTS
HOUSING
LOCATE .040"
FEELER GAGE
ANCHOR BLOCK
FIGURE 45
1. Turn OFF all power to the machine and lock the
electrical disconnect.
2. Place two jacks between the bed and ram. Locate one
near each end of the ram. Apply sufficient pressure
on each jack to support the weight of the ram, slide
and piston. Be sure to protect the ram nose so the
jack does not damage it.
3. Remove female quick-disconnect fitting from a pressure
gage. Attach a shut-off valve with a flexible hose on
its outlet to the quick-disconnect. Install this
assembly to counterbalance check port on side of
machine where ram is the highest. The hose should
be long enough to reach the reservoir oil fill opening.
4. The lower area of the cylinder can now be drained by
opening the valve. The high side of the ram should
be bled down until the ram is parallel with the· bed.
As this is done, it will be necessary to lower the
corresponding jack. When the ram is back in a
parallel position, the tilt limit switch will activate the
electrical circuit and the drive unit can be started.
TILT LIMIT SWITCHES (FIGURE 46)
T.wo limit switches are mounted on the right ram slide (back
SIde of ram) for limiting the maximum ram tilt. Should the
ram exceed its allowable tilt, these switches will shut off
the drive motor. To set these switches the bed and ram
sh?uld be para~lel (±~/16tt) to one another. The tripping
pOInt of the sWltches IS measured by passing a feeler gage
past the rollers holding it flat against the side of the ram
guide. The limit switches should be positioned so a
.028/ .032
Jt
feeler gage trips the switches.