Tools Required - Accusonic 8510+ series Reference Manual

Caution: Always work from the side of the transducer feedthrough, so that if an error or a
component failure results in the transducer blowing out of its seat, you are not in the exit
trajectory. Keep the trajectory area clear of other personnel.
Warning:
Read through the entire procedure below to be certain you understand it
completely.
IF YOU DO NOT UNDERSTAND ANY PORTION OF THIS PROCEDURE, STOP FURTHER
WORK, DO NOT CONTINUE!
Notes: Transducers are position-specific. Always reinstall a transducer in the same feedthrough
position from which it was removed. When replacing one transducer with a new one, double check
that the part number of the new unit exactly matches the number of the old one.
Hydrostatic pressure is pushing radially outward on the transducer at all time, including during
removal and replacement of the transducer. During normal operations, the transducer is held in
place against this pressure by the union nut shown in Figure 10-1 on page B-12.
When the nut is removed, then the locking pin prevents transducer movement. It is extremely
important that locking pin engagement be confirmed (using the supplied gauge) before attempting
to remove the union nut.
The locking rings which are installed in numbered pairs - the serial numbers are stamped on the
opposite mating faces. Parts from on locking ring must not be interchanged with other units. If a
ring is disassembled, it must be reassembled using a matched pair.

Tools Required


7601 series clearance gauge (attached to transducer fitting on the conduit)

Model 7642 series transducer jacking mechanism (order from Accusonic)

Medium (8 inch) crescent wrench (or 1/2 inch (13mm) open-end wrench)

3/8 inch hex (Allen) wrench
Perform the Maintenance
1. Verify the following safety conditions are met below. See Figure 10-1 on page B-12.

Locking Pin is Fully Engaged Check that the clearance between the shoulder of the pin and
the face of the locking ring is less than the specified limit. Check this by trying to slide the u-
shaped end of the clearance gauge under the pin as shown. It must not fit.

Locking Ring is Tightly Installed Check that lock washers (spacers) are installed between
both sets of mating faces of the two halves of the locking ring. Verify that the hardware is tight
and that the lock washers are compressed flat.

Union Nut Rotates Freely Check that the union nut turns freely and exhibits no resistance to
turning caused by back pressure on the nut from the transducer behind it after it has been loosened
one-half turn.
If any one of these conditions is not met, there may be a safety hazard. Leave the union nut in
place, STOP WORK on the transducer IMMEDIATELY and contact Accusonic for advice.
2. Locate the jacking screw in the jacking mechanism, shown in Figure 10-2 on page B-13. Make certain
that the valve on the jacking mechanism is fully open.
3. Spin the bearing lever so that the threaded tip of the jacking screw is retracted inside the tool valve.
The jacking screw should extend beyond the bearing lever about two inches (50mm) as shown in the
inset of Figure 10-2 on page B-13. It may be necessary to rock the valve slightly to allow the jacking
Transducer Maintenance B-5