Vertical Express I-2 - Page 40

Reference Material I-2 / I-3 Valve
38 ©Vertical Express
Troubleshooting Flowcharts
(continued)
Flowchart 16
A
Install pressure gauge
at bleed plug at jack.
Record pressure as
empty car runs up and
down past a given
point.
Is difference in
pressure more than
25 PSI?
Remove and examine
lowering piston.
Is distance from seat
to bottom of slots
more than 1/8”?
Replace valve.
Adjust job.
Replace lowering
piston.
Verify proper
performance.
Run car from bottom to
top. Record pressure
every 3’ 0” as car runs
up.
Did pressure
increase and then
drop back at any one
spot?
Run car down. Record
pressure every 3” 0” as
car runs down.
Did pressure
decrease and then
climb at any one
spot?
Jack is probably dog-
legged at that point.
B
Flowchart 17
A
Flowchart 17
No
Yes
Yes
Yes
Yes
No
No
No