INSTALLATION PROCEDURE / ADJUSTMENTS 
(cont.) 
Pusher Spring 
1.  Attach spring (#63) in uncoiled position to pusher (#55) 
using roll pin (#64). 
2.  Insert slotted spring bolt (#57) through spring spool bracket. 
3.  Align spring end with hole in spring spool bracket and pass 
end of spring through bolt slot. 
4.  Pull pusher to the end of the magazine and clamp spring. 
5.  Using an Allen wrench, turn slotted bolt to wind spring 
until coil is completely tight. 
6.  Tighten spring bolt and Flexlock nut. 
Throttle valve 
Follow these steps after completing tool assembly in order to 
minimize the time and effort required for optimum throttle valve 
adjustment: 
1.  Using the valve stem, slowly screw in the front valve seat 
(#48) until it bottoms, then back it out 1-1/2 turns. 
2.  Do the same with the rear valve seat (#5). 
3.  Attach an air line and fully depress the trigger.  AIR 
SHOULD LEAK OUT THE REAR VALVE SEAT.  While 
depressing the trigger, slowly turn in the rear valve seat 
(#5) until the air stops leaking. 
4.  Release the trigger.  AIR SHOULD LEAK OUT OF THE 
HANDLE.  Place a 3/16 wrench on the trigger valve stem 
(#47) and turn the front valve seat (#48) in slowly until the 
air stops leaking from the handle. 
5.  Gently depress the trigger.  Air should flow evenly from the 
rear exhaust to the handle exhaust. 
6.  The valve should now be adjusted - test the tool 
7.  Tighten the front and rear valve seat locking set screws 
(#19) and re-test the tool. 
8.  Do not loosen or tighten center locking set screw (#19) it 
is  pre-set from Spenax. 
9.  Do not screw set screw (#1) in too far or it will result in the 
tool running sluggish by restricting the air flow. 
 
 
 
 
 
 
 
 
TOOL LEAKS AIR OR IS SLUGGISH 
1.  If tool is leaking air in the throttle area, see “Throttle Valve 
Adjustment” section. 
2.  Should the tool leak air in both the triggered and rest 
positions, a damaged piston o-ring may be the cause.  Once 
the piston o-ring has been replaced, lubricate with lithium 
grease.  Tilt the front of the tool to one side to allow the o-
ring on the piston to pass the notch on the cylinder liner.  If 
this procedure is not followed, the o-ring may be damaged 
during the insertion of the piston assembly into the cylinder 
housing. 
3.  If the tool still continues to leak, the liner may be leaking 
between the housing.  The tool should be sent back to 
Spenax for repair. 
4.  In the event the rear throttle valve screw is turned in too far, 
the tool will operate slowly or in a sluggish manner during 
the opening/loading sequence.  This screw controls the 
amount of rear exhaust.  When properly adjusted, two or 
three threads should be exposed once the nut and washer are 
in place. 
 
LUBRICATION 
1.  The “SC” series Flex-C tools are designed for long, trouble-
free service with minimal air line lubrication.  (If an in-line 
lubricator is used, it should be set at the minimum rate of 
flow.) 
2.  Excess oil in the tool will attract dirt, lint, and the adhesive 
material used in collating the fasteners, preventing smooth 
operation.  When lubrication is used, always use a good 
grade of 5W non-detergent oil with no additives. 
3.  When servicing or repairing tool use lithium grease on all 
moving parts. 
 
FILTER AND REGULATOR 
1.  The air line should always contain a filter and regulator unit
 
to provide the tool with a constant flow of clean, dry air.  If 
moisture and contaminates are allowed to enter the tool, the 
tool’s serviceable life will be decreased. 
2.  The regulator should be set between 100 and 105 psi. (6.90 
- 7.24 bar).  Never operate this tool beyond 115 psi. (7.93 
bar). 
 
TIPS ON EXTENDING TOOL LIFE 
The serviceable life of the “SC” series tools can be extended 
greatly by using the following guidelines: 
1.  Always use Stanley Spenax brand fasteners.  Never replace 
worn or broken parts with anything other than genuine 
Stanley Spenax parts.  Generic fasteners may shorten the 
life of your Flex-C tool and will void the manufacturer’s 
warranty. 
2.  Keep your tool(s) clean and dry.  Always use clean, dry air 
and never exceed the recommended air pressure noted 
above. 
3.  Use of this tool at minimum air pressure required for the 
work at hand will greatly extend the life of the tool. 
4.  Exercise caution not to drop equipment.  Tools dropping 
onto the floor or ground is a primary reason for parts 
replacement. 
 
HELPFUL HINTS FOR FIELD SERVICE TOOL JAMS 
1.  The most common reason for jamming problems in the SC 
tool is operator error.  Because of the tool’s valve unit, the 
trigger must be pulled completely to the rear to ensure 
positive functioning of the valve.  If the tool is “short 
cycled,” the feed mechanism will return forward 
prematurely in an attempt to pick up a second ring.  This 
will most likely cause a jam. 
2.  If a jam occurs, pull pusher back and remove remaining 
rings from magazine.  Point tool away from yourself and 
others, and cycle tool slowly.  This should force jammed 
ring(s) out of jaw mechanism. 
3.  If procedure “2” does not clear the tool, disconnect air, lay 
tool on a clean flat surface and remove top jaw bolt and nut, 
and pull top jaw and bushing from tool.  Jammed rings are 
now exposed and may be removed from tool.  Remove 
build up of dirt, lint, and any other foreign debris and check 
for worn or damaged parts.  Re-assemble in reverse order. 
4.  Replace worn or damaged parts to keep tool operating 
properly. 
 
 
 
 
 
 
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