7
III – Operation
A. Fluid Recommendations
Use clean petroleum oil meeting or exceeding lubricating
qualities of SAE 20-20 W API service classification “MS”.
Type “A” automatic transmission fluid is also permissible.
Drain and refil the unit with new fluid every 1000 hours of
operation or six months, whchever comes first.
B. Start-up
The following procedure must be followed for initial start-up
and each time the units are drained and refilled. (See “Fluid
Recommendations”)
1. Fill the TR3 or PTR3 unit to the bottom of the filler cup
screen. Fill the MTR3 unit with fluid and connect the drain
line to tank.
2. Couple the power source to the “A” end, but leave the
“B” end uncoupled.
3. Start the power source. Allow the unit to run for about
five minutes after the output shaft begins to rotate. It may
tank a few minutes to eliminate the air in the system.
4. Stop the power source and couple the “B” end to the
load.
5. Add fluid until the level is again at the bottom of the
filler cup screen. The system can now be started under load
until the fluid is next changed.
C. Handwheel Control
The handwheel control is a manual device for varying the
output shaft speed from zero to full speed in either direction.
The dial calibrations (0, 25, 50, 75 and 100) represent the
output shaft speed as a percentage of the input shaft speed.
D. Servo Control
The servo control is a mechanically operated hydraulic
booster for varying the output shaft speed with minimum
effort (approximately 7 ounces on the control pin).
The control arm may be rotated to any position about the
control shaft. For the most satisfactory results, the control
arm must be located at 90
°
to the direction of controlling
efforts.
The control arm requires a 20
°
angular movement to change
the output shaft speed from zero speed to full speed, or a
40
°
angular movement from full speed in one direction to full
speed in the opposite direction.
The maximum angular movement of the control arm must
not exceed 20
°
each side of neutral.
It is not recommended that the control arm be actuated while
the drive is shut down. If, however, it is necessary to move
the stroke control arm without the aid of hydraulic boost, it
should be done slowly in order to avoid damage to the
internal parts.
The servo control provides the most rapid means of
controlling speed. With an input speed of 1750 rpm, the
control may be moved from zero to full output speed in one
second; at 1150 rpm input speed the time required is three
seconds. Control movement in excess of that specified may
cause internal damage.
Section IV – Maintenance and Repair
The longevity of these products is dependent upon
environment, duty cycle, operating parameters and system
cleanliness. Since these parameters vary from application to
application, the ultimate user must determine and establish
the periodic maintenance required to maximize life and
detect potential component failure.
The only maintenance required is to change the fluid every
1000 hours or six months, whichever occurs first, and to
maintain shaft alignment.
When a unit requires repair, it is recommended that it be
returned to Vickers. A stock of rebuilt exchange units is
maintained at all Vickers branch warehouses. All rebuilt units
carry the new unit warranty.
For customers who have the facilities to repair these
precision units, the parts catalogs listed below are available
from any Vickers branch or district office.
Model Number
Catalog Number
TR3
I-3815-S
MTR3
I-1839-S
PTR3
I-1840-S
