Cashco 8900 - Manual (Page 3)

3 IOM-8900 Series
SECTION III
III. MAINTENANCE:
WARNING
SPRINGS UNDER COMPRESSION. Relieve spring
com pres sion per following steps. Failure to do so
may result in fl ying parts that could cause personal
injury.
DISASSEMBLY FOR INSPECTION
To remove the vent from the tank nozzle, loosen
and remove the fl ange bolts and nuts from the tank
nozzle and fl ange seat (1). Attach lifting cables or
straps to the lifting lugs/eyebolts (39). Be sure to
utilize all lifting lugs in order to keep the unit stable
during lifting and transportion.
A. Removal of Pressure Springs:
1. Place the vent fl ange (1) on a fl at work
surface. Measure the length of each compressed
spring (33) from the top surface of the pressure
pallet (3) to the top edge of the upper spring button
(34). Place a tag on each spring (33) and record
the height measurement for each. These values
will be required at re-assembly to reset the vent
spring pressure prior to installation.
2. Loosen and remove one “top” nut (35) from
each of the adjusting screws (31). Rotate remaining
nut (35) CCW evenly in 1/2” (13 mm) increments
to prevent unequal loads on the pallet/diaphragm
assembly. Continue this process until all nuts (35)
are removed.
3. Lift up to remove upper spring buttons (34)
(hole w/small I.D.) and springs (33).
B. Removal of Vacuum Spring - 8920 Only:
1. Remove cap screws (28) from the weather
hood (11) and lift off upper spring canister (15).
Measure the length of the pallet stem (21), top edge
of stem to the top surface of the upper spring button
(14). Record this value. It will be required during re-
assembly to reset the vacuum range spring pressure
prior to installation.
Length of pallet stem ________
NOTE: DO NOT allow vacuum pallet assembly
(18) to fall as disassembly continues.
2. Rotate each nut (25) CCW one at a time to
remove and to release the compression of the spring
(16). NOTE: May need to grasp a section of the
threaded stem (21) with soft-jawed pliers to prevent
rotation of the pallet assembly (18). Maintain grip
on stem (21) while carefully lowering vacuum pallet
assembly (18) to rest on work surface below.
Lift up to remove upper vacuum spring button (14)
and spring (16).
NOTE: If vent was not supplied with a fl ame screen
(5) remove lower spring button (14) and lower spring
canister (13). If vent included a fl ame screen, before
removing button (14) and canister (13), draw match
“marks” between fl ange face of the lower spring
canister (13) and weather hood (11).
WARNING
SPRING UNDER COMPRESSION. Relieve spring
com pres sion per following steps. Failure to do
so may result in fl ying parts that could cause
personal injury.
The 8900 Series vents do not require any sort of
routine lubrication or adjustments, but should be
checked as part of a routine plant maintenance
program to confi rm that the vents are operating
properly. The ERV is a protection device and as
such will not normally cycle when in service. In order to inspect the pallets and pallet diaphragms
for damage the vent must be removed from the tank
nozzle. Follow all safety guidelines your company
has to decommission a vent for inspection. Cashco/
Valve Concepts does not recommend that a vent be
removed from a tank in service due to the potental
of hazardous tank vapors or fl ammable tank vapors.
SECTION IV
IV. DISASSEMBLY of the 8910 and 8920 Guided - Spring Loaded Relief Vents:
See page 8 for a listing of parts. For Model 8910 (Figure 1) disregard item numbers 5 - 25, 28, 36, 40 - 60, 62
- 74 and 76. These parts are for vacuum service option for the Model 8920 and do not pertain to the pressure
only function of the 8910.