SECTION II
TESTING AND TROUBLESHOOTING
Table 2-1. Troubleshooting Guide
Page 2-15Printed in U.S.A.
Problem Symptom Probable Cause Check Correction
One function's cylinder(s)
is drifting.
One function's cylinder
drifts over time.
Valve spool for suspect
function is malfunctioning -
stuck open.
Check for foreign matter
in valve spool.
Remove valve spool and clean
valve spool ports out.
Replace valve spool
component if necessary.
One of pilot operated check
valves for suspect function is
malfunctioning - stuck open.
Check for broken or bent
components or foreign
matter in pilot operated
check valve.
Remove pilot operated check
valve components. Clean any
foreign matter. Replace any
broken or bent components.
Hoses or tubes are leaking
oil.
Check for leaking oil. Replace hoses or tubes. If
necessary add oil to slave line
of function. Refer to para 4.7,
or 4.8.
One function is jerky when
selected; all other functions
operate properly.
Function starts off with a
jerky movement and then
moves smoothly.
Valve spool for suspect
function is malfunctioning -
stuck open allowing oil to
drain from valve spool.
Check for foreign matter
in valve spool.
Remove valve spool and clean
valve spool ports out.
Replace valve spool
component if necessary.
One of pilot operated check
valves for suspect function is
malfunctioning - stuck open,
allowing oil to drain out of
check valve.
Check for broken or bent
components or foreign
matter in pilot operated
check valve.
Remove pilot operated check
valve components. Clean any
foreign matter. Replace any
broken or bent components.
Seat cylinders are not
synchronized.
Seat board cracks during
movement of function or
noticeable difference in
cylinder synchronization is
noticed.
Oil needs to be added or
removed from the seat slave
line.
_ Adjust the oil volume in the
seat slave line by performing
seat cylinder synchronization
procedure. Refer to para 4.6.
When COLUMN DOWN
function is selected, table
jerks downward.
Function starts off with a
jerky movement and then
moves smoothly.
Oil needs to be removed
from the column slave line.
_ Adjust the oil volume in the
column slave line. Refer to
para 4.7.
The column function will
not reach full height.
Column cylinder does not
extend fully.
Oil needs to be added to the
column slave line.
_ Adjust the oil volume in the
column slave line. Refer to
para 4.7.
Head section does not
operate properly.
When release lever is
squeezed, head section
cannot be moved.
Release point of gas
cylinder(s) in head section is
out of adjustment.
Check release point of
gas cylinder(s).
Adjust release point of gas
cylinder(s). Refer to para
4.43.
Gas cylinder(s) is
malfunctioning.
Replace suspect gas
cylinder with known
working gas cylinder.
Replace gas cylinder(s).
Refer to para 4.43.
Head section drifts up or
down without release lever
being squeezed.
Release point of gas
cylinder(s) in head section is
out of adjustment.
Check release point of
gas cylinder(s).
Adjust release point of gas
cylinder(s). Refer to para
4.43.
Gas cylinder(s) is
malfunctioning.
Replace suspect gas
cylinder with known
working gas cylinder.
Replace gas cylinder(s).
Refer to para 4.43.
Latching mechanism is not
working correctly.
Section is not automatically
captured by latching
mechanism.
Latch spring pack assembly
is malfunctioning.
Check for broken spring
in latch spring pack
assembly.
If necessary, replace latch
spring pack assembly. Refer
to para 4.45.
Foreign matter is causing
latch spring pack assembly
to bind.
Check for foreign matter
build-up.
Remove latch spring pack
assembly and clean
components in latch spring
pack assembly. Refer to para
4.45.
Latch handle is binding. Check for foreign matter
build-up.
Remove latch handle and
clean. Refer to para 4.45.
© Schaerer Mayfield USA, Inc. 2004
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