dadco SC Series Maintenance Instruction

Super Compact
Nitrogen Gas Springs
SC (98.80) Series Gas Spring Repair Instructions
Models: 01800, 03500, 04700, 07500, 11800 & 18300
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his service manual is a simple step-by-step maintenance guide for DADCO Nitrogen Gas Spring SC Series (98.80) Models 01800, 03500, 04700,
07500, 11800 and 18300. Typically, SC / 98.80 Series Nitrogen Gas Springs can be rebuilt by simply replacing the piston rider and piston seal. After
reviewing this maintenance guide, if you require any additional training or have any questions please contact DADCO for assistance.
DADCO's SC models 01800-18300 a special Rear Head Tool (98.328) is required.
I. Exhausting Pressure
Self-Contained Mode
1. When exhausting pressure, 2. Remove the port plug, and
position the gas spring sealing washer, (90.505.110),
upside down in a vise so that located on the bottom of the
the cylinder is secured. Be spring with the Port Servicing
sure to wrap the spring in Tool, (90.320.8). Retain parts
cardboard to protect it from for use during reassembly.
the vise.
4. Unscrew the bolts on the
3. Remove the mount,
sub plate and remove the sub
if necessary, securing
plate.
the cylinder to the plate.
Unthread the service fitting
and wipe with a clean cloth.
Retain parts for use during
reassembly.
Note: The repair of DADCO' s Super Compact Nitrogen Gas Springs is unlike standard gas spring repair. Please follow the instructions and illustrations carefully.
III. Rod Assembly & Rear Head Removal
8. Wrap the cylinder in 9. Remove the seal and
cardboard and place in a vise. piston rider. Pry the seal
With a soft rubber mallet tap off the rod using the Port
the rod down through the tube. Servicing Tool, (90.320.8),
This will push the rear head be careful not to scratch
out at the same time. Note: the inside of the groove.
You will need to guide the Discard the seal and piston
parts as they are pushed out. rider.
To avoid damaging the piston
rod or bore do not let them
drop onto a hard surface.
Repair Tools
T-Handle
90.320.2
Plastic Assembly Blade
90.357
C-Ring Removal Tool
90.356
Nitrogen Gas Spring Maintenance Instructions SC (98.80) Series
3. Keeping face and hands
clear of the port, use the
Valve Bleed Tool, (90.360.4),
or the Port Servicing Tool,
(90.320.8), to depress the
Cartridge Valve, (90.265)
or Compact Valve (90.260).
Cover the port with a cloth to
absorb discharge.
II. C-Ring Removal from Base
5. Hold the discharged gas
spring upside down. Using
a rubber mallet gently tap
the rear head down into the
tube. It may be necessary to
depress the valve stem again
to release any back pressure.
10. Using the Plastic Assembly
Blade, (90.357), remove the
O-Ring Backup, (98.249.80.x),
and the O-Ring, (98.245.80.x),
from the rear head and discard
if damaged. If not damaged
you may reuse these items.
Port Servicing Tool
90.320.8
C-Ring Installation Tool
90.352
Rear Head Tool
90.328
CAUTION: Always wear safety goggles when performing any maintenance work.
Open-Flow Mode
1. Exhaust nitrogen gas by
4. After all the gas pressure
is exhausted remove the gas opening the bleed valve on
the control panel.
spring from the vise, be sure
that the piston rod will freely
retract into the tube manually.
If not, try depressing the valve
again. If still unsuccessful
STOP and contact DADCO.
6. Remove the C-Style
Retaining Ring, (98.285.80.x),
using the C-Ring Removal Tool,
(90.356). Position the hooked
end of the C-Ring Removal
Tool below the c-ring. For best
results locate the tool near
either end of the c-ring.
IV. Cleaning and Inspection
11. Inspect the tube assembly 12. Wipe the inside of the
for any damage. Polish out tube assembly with a clean
any burrs at the bottom of the dry lint-free cloth using a mild
tube assembly to avoid detergent if necessary.
damaging seals during the
reassembly process. If there
are any severe scratches in
the finish contact DADCO for
repair.
Bulletin No. B17103
Comprehensive Guide
This service manual is a step-by-step
maintenance guide for DADCO's Super
Compact (SC) Nitrogen Gas Springs.
Proper repair requires careful
examination of all component parts
and replacement of any that are worn
or damaged. All DADCO replacement
parts are available from factory stock.
After reviewing this maintenance guide,
if you require any additional training
or have any questions please contact
DADCO for assistance.
Note: DADCO Nitrogen Gas Springs are permanently
marked with model number, serial number and
repair kit number. Please refer to these when
ordering replacement parts.
NOTE: To repair
2. Verify that all pressure is
relieved by manually
retracting the piston rod
into the tube. If the rod will
not fully retract release the
remaining pressure. If still
unsuccessful STOP and
contact DADCO.
7. Once the hooked end of
the tool is firmly seated below
the c-ring, begin pushing it
toward the outside of the gas
spring can. The handles will
close naturally, and the c-ring
will be extracted as you
complete this motion. Request
the C-Ring Removal Tool
Bulletin for more information.
13. Wipe the rod and rear
head with a clean dry lint-free
cloth.
Nitrogen Gas
Spring Maintenance
Instructions
SC Series
Models: 01800, 03500,
04700, 07500, 11800 & 18300
®