Safe-Stop
®
180 TMA
40
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rroubleshooting Guide (cont'd.)
oubleshooting Guide (cont'd.)
oubleshooting Guide (cont'd.)
oubleshooting Guide (cont'd.)
oubleshooting Guide (cont'd.)
Note: On applications where a hydraulic compo-
nent is being replaced, contact Energy Absorption
Systems' Customer Service Department to verify
component compatibility.
C
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C
Cylinder Chec
ylinder Chec
ylinder Chec
ylinder Chec
ylinder Check
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Val
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1. PURPOSE
The cylinder check valves allow free flow of hydrau-
lic oil into the cylinders, but block exit flow until a
solenoid is energized. When a "STOP" button is de-
pressed, power to all coils is cut, preventing oil from
escaping the cylinders and locking the system.
2. REPAIRING CHECK VALVES
A. Symptoms
If the TMA exhibits a slow drifting of the folding
bay after either of the "STOP" buttons has been
depressed, one of the following may be true:
1. Improper grounding. Check grounds.
2. Incorrect voltage. Check power supply for
correct voltage supply.
3. The check vale poppet has become blocked
by foreign debris in the oil line.
4. The piston ring seals inside the cylinders
have been compromised.
WARNING!
Do not exceed pressure rating for hydraulic system
components! System pressure is set to 2000 psi at
the factory.
WARNING!
When the system is stopped at an intermediate angle,
there will be pressure on the oil in the hoses between
the check valves and cylinders! This pressure is
supporting the load of the folding bay! ALWAYS make
sure the TMA is completely folded or completely
unfolded before loosening a hose fitting or servicing any
check valve! This will minimize the chance of injury
from an uncontrolled falling load, or spray of high-
pressure oil.
B. Repair procedure
1. Blocked poppet
a. Again, make sure the system is com-
pletely folded or completely unfolded.
b. Loosen the nut that holds the solenoid
coil on the valve body, and remove the
coil from the cartridge valve, making
note of which coil goes to which car-
tridge.
c. Remove the cartridge from the valve
body, being cautious of oil spray from
residual pressure in the system.
d. Clean the cartridge using compressed
air, making sure to direct the air away
from anyone's face. Avoid breathing the
oil mist that this process may create.
e. Reinstall the cartridge and coil, making
sure to correctly match coil and cartridge
as they were before disassembly (this
will affect proper operation).
2. Piston ring seal
a. Refer to the following section on Hy-
draulic Cylinders.
Note: If the cartridge valve has failed in some other
way, do not attempt to repair it. Replace it with a
new valve by contacting Energy Absorption Sys-
tems' Customer Service Department.
Summary of Contents for Safe-Stop 180 TMA 9181
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