Tennant ATLV 4300 Service Manual page 139

2000 Series Disc Valve Motors
Reassembly —
Speed Sensor
1 Rotate the motor shaft until a (gear/target)
tooth is centered in the speed sensor port. If
this is not done, the sensor may be damaged
during the operation of the motor.
2 Make sure the lock nut and its threads are
clean and dry for the proper torque. Position
the lock nut against the alignment nut as
shown in Figure 22.
3 Move the washer and the o-ring up against
the speed sensor body threads as shown in
Figure 22.
4 By hand, lightly thread the speed sensor
body into the housing until the sensor
touches against the motor (gear/target) tooth.
Do not force the sensor against the (gear/
target) tooth, damage may occur. Make sure
the o-ring or the washer do not touch the
housing — see Figure 23.
5 Turn the speed sensor body out one quarter
turn (CCW) plus the additional amount (CCW)
needed to make the alignment notches
perpendicular to the motor shaft centerline
(90° +/-5 degrees from the motor shaft
centerline — Figure 24 and 25).
6 Maintain the speed sensor body alignment
(Figure 25), and tighten the lock nut to 8,5-14
Nm [75-125 lb-in.] (torque values are for
clean dry threads).
7 Check the speed sensor body for correct
alignment (Figure 25), reinstall the sensor if it
is not correct.
Figure 24
Speed Sensor Installation
Figure 22
Alignment Notchs
Perpendicular to
Centerline of Motor
Alignment Notch
90°
Back out
Lock Nut
11/16 inch
Hex Head
Speed Sensor Body
Alignment Nut
Lock Nut
Washer
O-ring
Speed Sensor Port
Housing
Gear/Target
Tooth
Alignment Notch
Figure 25
Figure 23
Alignment Nut
9/16 inch
Hex Head
Alignment Notch
9