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Space Pump
Skip Pump
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Needle Valves
Channel Plates
Check Valve
Hydraulic Motor)
Detent
Filter
Control Valve Assembly
7. Free the hydraulic drive unit.
a. Remove the electrical connections.
(1) Remove the top cover on the reservoir.
(2) Unplug the wires within the unit.
(3) Remove the two screws in the plug on the left
of the unit.
(4 ) Remove the wires from the unit.
(5) Replace the cover over the opening in the top
of the reservoir, and replace two screws to hold the
cover.
b. Remove the drive belt.
(1) Loosen the electric motor mounting screws.
(2) Lift the motor enough to free the drive belt.
(3) Clamp the motor at this position so that it may
be used for support later.
(4) Remove the drive belt.
c. Remove three holding screws nearest the front
( total of 4 ) for the hydraulic unit (in the reservoir
mounting plate fastened to the printer casting) .
(1) Remove the front holding screw.
(2) Remove the center lower holding screw.
(3) Remove the center upper holding screw.
8. Consider the problem of removing the hydraulic unit.
The unit is now being held by the rear mounting screw
and the boss around the output shaft. Care must be used
not to damage this shaft as the unit is removed. If possible,
it is recommended that two men remove this unit. The unit
must be withdrawn straight out to the right until the out-
put shaft is clear. The electric motor can be used as a rest
while supporting the unit.
9. Remove the hydraulic unit.
a. Support the unit.
b. Remove the rear mounting screw.
c. Remove the unit straight out.
Hydraulic Unit Replacement
1. Use the utmost care in replacing this unit.
2. Follow the removal steps in the reverse order.
3. Do not fill the hydraulic unit with used fluid. Fill it
with one gallon of new fluid (P/N 477567) which will pro-
vide the proper level (approximately to the bottom of the
coils) . Insure that the fluid drain is closed before filling.
4. Make any adjustments that are reflected by the work
done inside the unit, and always include these:
a. the emitter brush.
b. the tape brushes dynamically.
Hydraulic Unit Reservoir Removal (Figure 9)
1. Remove the 1403 covers.
a. Remove the front cover.
b. Remove the rear cover.
c. Remove the top cover.
d. Remove the right cover.
e. Remove the front inner cover.
2. Determine whether the reservoir mounting plate
(fastened to printer casting) has the reservoir fastened
to it from the left or from the right.
3. If the reservoir is fastened from the left,
a. remove the hydraulic unit ( See Hydraulic Unit Re-
moval).
b. proceed to step 5.
4. If the reservoir is fastened from the right,
a. drain the oil from the reservoir.
b. remove the sense amplifier mounting plate.
c. remove the blower.
d. remove the carriage tape idler mounting plate.
e. remove the screws from the rear heat sink resistor
panel.
5. Remove the reservoir. Sixteen screws hold it in place.
6. Replace in a similar manner, but in reverse order.
7. Replace the remaining parts in reverse order.
Remove Control Valve Assembly (Figure 10)
1. Remove the 1403 covers.
a. Remove the front cover.
b. Remove the rear cover.
c. Remove the top cover.
d. Remove the right cover.
e. Remove front inner cover.
2. Determine whether the reservoir mounting plate fas-
tened to the printer casting has the reservoir fastened to it
from the left or from the right.
3. If the reservoir is fastened from the left,
a. Remove the hydraulic unit.
(See
Hydraulic Unit
Removal.)
b. Remove the reservoir. Eight screws hold it in place.
c. Remove the valve body assembly. Four screws hold
it in position.
d. Proceed to step 10 of reassembly.
4. If the reservoir is fastened from the right, prepare to
remove the reservoir.
a. Drain the oil from the reservoir.
b. Remove the sense amplifier mounting plate.
c. Remove the blower.
d. Remove the carriage tape idler.
e. Remove the screws from the rear heat sink resistor
panel reservoir.
5. Remove the reservoir. Sixteen screws hold it in place.
They are all accessible from the right.
6. Remove the wires from the terminal strip for the con-
trol magnets.
7. Remove the valve body assembly. Four screws hold
it in place.
8. Replace in a similar manner but in reverse order.
9. Replace the remaining parts in reverse order.
Hydraulic Unit Reassembly (Figure 10)
1. The channel plate assembly should never be separated
from
the reservoir mounting plate (P/N 444320), unless a
pump or motor is replaced.
2. Any time the hydraulic unit is disassembled where
the channel plate assembly is separated from the reservoir
mounting plate (P/N 444320), it is essential that the sup-
porting bearing for the input shaft of each pump and for
the output shaft be re-adjusted upon assembly.
3. Reassemble the channel plate assembly to the reser-
voir mounting plate as follows:
a. Insert the holding screws and leave them loose.
b. Place the aligning tool
(P/N
450980) around the
output shaft of the motor and over the boss on the
reservoir mounting plate.
c. This tool will insure that the output shaft is cen-
tered in relation to the outside circumference of the
boss. Consequently, the output shaft will be in align-
ment with the supporting bearing in the casting of
the carriage.
d. Tighten the holding screws to fasten the channel
plate assembly to the reservoir mounting plate.
e. Remove the aligning tool.
Figure 10. Hydraulic Unit-Exploded View
4. Install the pump
and the motor oil seals. It is advis-
able to use new oil seals for the space pump and the skip
pump to minimize the possibility of leakage.
5. Reassemble the components, with the exception of
the pump pulleys, on the shafts of the pumps and on the
shaft of the motor. Support each shaft as these components
are pinned to it to prevent any bending of the shaft.
6. Reinstall the outboard bearing flanges as follows:
a. Slide the outboard bearing flanges in place around
the pump shafts and snug the holding screws.
b. Each shaft must be able to rotate freely.
(1) Rotate each shaft through at least 360° to
check for freedom from binds.
(2) It may be necessary to re-adjust the outboard
bearing flange by tapping lightly into the correct
position.
c. When the shaft rotates freely without binds, tighten
the holding screws to fasten the outboard bearing
flange securely.
d. Recheck each pump shaft for freedom of rotation
after the holding screws have been tightened.
7. Reinstall the pulleys on the shafts, and fully support
each shaft to prevent bending as the pulley is pinned to
the shaft.
8. Check or make ( as required) all hydraulic unit ad-
justments that can be made with the reservoir removed.
9. Replace the valve
body
assembly. Four screws hold
it in position.
10. Replace the reservoir. Sixteen screws hold it in place.
11. Make the following replacement and adjustments:
a. replace the hydraulic unit.
b. adjust the space needle valve.
c. adjust the skip needle valve.
d. adjust the bypass needle, valve.
e. adjust the single-space single shot.
f. adjust the emitter brush.
g. adjust the carriage tape brushes dynamically.
Hydraulic Pump Drive Belt Tension
Shift the drive motor in its slots to obtain 1 /8 to 3'2"
deflec-
tion of the belt halfway between the drive motor and the
eject pump with a force of one pound ( about 450 grams) .
Carriage Controls
Space
Control Magnets Adjustments
1. Spacing and skipping failures are usually caused by
circuit malfunctions, in particular, the emitter brushes.
The hydraulic unit is quite reliable; it should be the last
place to check for malfunctions.
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REMOVALS AND ADJUSTMENTS
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