End-Cap Removal Procedures - Teledyne WORKHORSE Operation Manual

May 2015

End-Cap Removal Procedures

CAUTION
Contents May be
Under Pressure.
Refer to Operator's
Manual Prior to
Servicing.
Caution label on End-Cap
90Z-6038-00
Wear safety glasses and keep head and body clear of the end-cap while opening.
Any system that was deployed may have pressure inside the housing.
When you need access to the electronics, TRDI recommends removing the housing assembly
(see Housing Assembly
The end-cap should only be removed if the O-rings or desiccant need to be replaced for periodic
maintenance.
To remove the end-cap:
1. Dry the outside of the H-ADCP.
2. Disconnect the I/O cable and install the dummy plug.
3. Stand the H-ADCP on its transducer faces on a soft pad.
4. Inspect the housing and end cap bolts for any signs of damage such as bending, stretched bolts,
crushed or deformed bushings, etc. These signs may indicate that there is internal pressure inside
the system.
5. To avoid any possible injury it is ALWAYS recommended that you loosen but do not remove the
four end-cap bolts to allow any internal pressure to be vented from the system. Loosen the end-
cap bolts two turns each in a cross-pattern. Repeat until the face seal O-ring is not
compressed and the system has the opportunity to vent. If you note that the end cap
moves as you loosen the bolts then this may indicate that internal pressure is present. Be sure to
only loosen the bolts far enough to allow the system to vent.
6. Once all four end-cap bolts have been loosened and you are sure that there is no internal pressure,
remove the bolts from the end-cap.
Make sure you save all hardware removed during this procedure for re-assembly.
7. Carefully pull the end-cap away from the housing until you can gain access to the connector jack
on the common mode choke. Use care; the plastic mating surfaces scratch easily. Do not damage
the mating surfaces.
8. Squeeze the sides of the internal I/O cable connector to release it from the common mode choke
jack. Set the end-cap aside.
9. Clean the O-ring mating surfaces with a soft, lint-free cloth. Inspect the surfaces for damage (see
O-ring Inspection and
seal.
Page 50
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Removal). Use Parts Location Drawings
Replacement). Even small scratches can cause leakage around the O-ring
WorkHorse H-ADCP Operation Manual
for parts identification.