Hawkeye Marsh Hawk - Manual

► 3/4 in. Box / Socket Wrench
► 1/2 in. Box / Socket Wrench
► 9/64 in. Allen Wrench
This document contains the recommended procedures installing and maintaining a Hawkeye Marshhawk Thief Hatch.
Requirements
The Marshhawk has a standard 8” API flange connection, and re-
quires a SCH 40 or lighter nozzle. Other mounting options, such
as ANSI flange or other API connections are accommodated with
adaptor spools and risers. Consult the vapor control section of our
website, or call us for more information.
Tools
Parts Required
A.) Installing the Marshhawk Thief Hatch
Place Tank Gasket on the 8” API Tank Flange
and align holes.
Installation & Maintenance Guide
Marshhawk Thief Hatch
QTY Part
Installation
► 1 Marshhawk Thief Hatch
► 1 8” API Tank Gasket
► 16 1/2 UNC x 1-3/4 Bolts & Nuts
► varies 2 ozsi and 1 ozsi Pressure Spacers as required.
Maintenance
► 1 Replacement Pressure / Vacuum Gasket
► Dow Corning #4 Electrical Insul. Compound (or eq.)
1.)
Fasten with the supplied 1/2 UNC Bolts and
Nuts with a 3/4 Box or Socket Wrench
3.)
Mount Marshhawk on base gasket and align
holes.
2.)
Remove the spider cage assembly by pressing
down on spring retainer and rotating counter
clockwise to disengage from J-slot. Lift spider-
cage assembly straight out of the hatch body.
G
1.)
Use spring retainer to compress the spring.
Remove the retainer screw and washer with
the 1/2 wrench, and remove the spring retainer.
2.)
Add or remove pressure spacers to increase or
decrease activation pressure, respectively.
Each standard pressure spacer changes acti-
vation pressure by 2 ozsi. Follow directions in
reverse to reassemble the thief hatch.
Hawkeye recommends activation pressure 2 ozsi
below the tank’s pressure rating.
3.)
Marshhawk Installation Instructions, May 2010 1
Contents
A.) Installing the Marshhawk Thief Hatch
A1.) Hatch Installation
A2.) Pressure Spacer Adjustment
B.) Maintaining the Marshhawk Thief Hatch
B1.) Replacing Pressure / Vacuum Gasket
B2.) Relubrication
B3.) Antifreeze solutions
A1.) Hatch Installation
A2.) Pressure Spacer Adjustment
↑P ↓P
► ►
►
►
SCH 40
or lighter