Maintenance And Service; Maintenance And Cleaning; Maintenance Schedule - Bosch GSN 90-21 RK Notice Originale

OBJ_BUCH-1037-004.book Page 15 Thursday, August 16, 2012 4:34 PM
Do not shoot a nail onto an already driven-in one. This
could cause the nail to deform, the nails could become
jammed or the pneumatic tool could move uncontrolled.
When the pneumatic tool is used under cold ambient con-
ditions, the first nails will be driven in slower than usual.
Once the pneumatic tool has warmed up during working,
normal operating speed will be regained.
Avoid blank shots in order to reduce the wear of the impact
striker.
For longer work breaks or after finishing work, disconnect
the pneumatic tool from the air supply and empty the mag-
azine.
Emptying the Magazine
– Pull back the magazine slider 7 until it engages at the
rear.
– Remove the nail strips 14.
Discard nail strips with less than 5 nails.
– Completely pull back the magazine slider 7 once more
to free the lock.
– Carefully guide the magazine slider to the front until it
touches the beginning of the magazine.
Note: Do not let the magazine slider snap back without
guiding it. Otherwise, the magazine slider could become
damaged, and there is danger of your fingers being caught
or pinched.
Adjusting the Depth Stop (see figure E)
The driving depth of the nails can be set with thumbwheel
3.
– Empty the magazine 8.
(See "Emptying the Magazine", page 15)
– Nails are driven in too deeply:
To reduce the driving depth, turn thumbwheel 3 in
clockwise direction.
or
Nails are not driven in deep enough:
To increase the driving depth, turn thumbwheel 3 in an-
ticlockwise direction.

Maintenance and Service

Maintenance and Cleaning

Disconnect the air supply before making
any adjustments, changing accessories,
or placing the pneumatic tool aside. This
safety measure prevents accidental start-
ing of the pneumatic tool.
If the pneumatic tool should fail despite the
care taken in manufacture and testing, repair should be
carried out by an authorised customer services agent for
Bosch power tools.
In all correspondence and spare parts orders, please al-
ways include the 10-digit article number given on the type
plate of the pneumatic tool.

Maintenance Schedule

Always keep air outlet 4, discharge lock-off 2 and trigger
10 clean and free of foreign material (dust, chips, sand,
etc).
Measure
Draining the exhaust filter daily.
Keeping the lubricator filled at all times.
Cleaning the magazine 8 and magazine slider 7.
Ensuring that the discharge lock-off 2 functions properly.
Lubricating the pneumatic tool.
Draining the compressor.
Bosch Power Tools
– Refill the magazine.
(See "Loading the Magazine", page 14)
– Test the new driving depth on a test workpiece.
Repeat the worksteps as required.
Clearing Jams (see figures F1–F3)
Single nails can become jammed in the shot duct. If this
should occur frequently, please contact an authorised
service agent for Bosch power tools.
– Empty the magazine 8.
(See "Emptying the Magazine", page 15)
– Open the magazine lock 15.
– Pull the magazine 8 away from the housing until it slips
off of lock pin 16.
This makes the jammed nail in the shot duct accessible.
– Remove the jammed nail. For this, us a pair of pliers, if
required.
– When driver blade 17 is extended, push it back into the
piston using a lubricated screwdriver or other suitable
lubricated object.
– Lubricate the shot duct with 2–3 drops of engine oil
(SAE 10 or SAE 20).
– Reinsert the magazine 8 again:
Open the magazine lock 15, if required. Guide lock pin
16 into the opening of magazine holder 18. Align the
magazine to magazine retainers 19 and push the maga-
zine completely to the front. Lock the magazine by com-
pletely folding magazine lock 15 up.
– Refill the magazine.
(See "Loading the Magazine", page 14)
Changing a Magazine Rail (see figure G)
The magazine rails 20 can wear after prolonged use of the
pneumatic tool.
Replace defective magazine rails.
– Empty the magazine 8.
(See "Emptying the Magazine", page 15)
– Loosen locking screw 21 (3 mm) with the supplied Allen
key.
Have maintenance and repair work carried out only
through qualified persons. This will ensure that the
safety of the pneumatic tool is maintained.
An authorized Bosch after-sales service agent will carry out
this work quickly and reliably.
Clean the magazine 8. Remove any plastic or wood chips
that may accumulate in the magazine during operation.
Explanation
Prevents the accumulation of dirt/ debris and moisture in the
pneumatic tool.
Ensures the lubrication of the pneumatic tool.
Prevents the jamming of nails.
Promotes your work safety and efficient usage of the pneu-
matic tool.
Reduces the wear of the pneumatic tool.
Prevents the accumulation of dirt/ debris and moisture in the
pneumatic tool.
English | 15
– Pull cover lid 22 out of the magazine 8.
– Allow the defective magazine rails 20 to slide out of the
magazine.
– Insert new magazine rails into the magazine.
– Insert cover lid 22 back into the magazine and tighten
locking screw 21.
Changing the Workpiece Protector (see figure H)
The workpiece protector 1 at the end of the discharge lock-
off 2 protects the workpiece until the pneumatic tool is cor-
rectly placed for the driving procedure.
The workpiece protector can be removed and replaced.
– Remove spring clip 23 and pull the workpiece protector
from the discharge lock-off 2.
– Push the new workpiece protector over the discharge
lock-off and mount the spring clip again.
Stationary Use of the Pneumatic Tool (see figure I)
For stationary use, the pneumatic tool can be fastened to a
balancer.
The screwable eyelet 24 is required for this.
– Remove the rear screw of the exhaust cap with the sup-
plied Allen key.
– Screw the eyelet 24 firmly into the exhaust cap.
– Hook the eyelet to the balancer hook.
Transport and Storage
For transport, disconnect the pneumatic tool from the air
supply; especially when using ladders or moving in an unu-
sual stance or posture.
At the workplace, carry the pneumatic tool only by the han-
dle 5 and with the trigger 10 released.
Always store the pneumatic tool disconnected from the air
supply and at a clean and dry location.
When not using the pneumatic tool for a longer period of
time, cover steel parts with a fine oil coating. This prevents
the formation of rust.
Lubricating the Pneumatic Tool (see figure J)
When the pneumatic tool is not connected to a mainte-
nance unit, it must be lubricated at regular intervals:
– For light-duty use 1x per day.
– For heavy-duty use 2x per day.
Apply 2–3 drops of lubricant into air connector 6. Do not
apply too much lubricant, which could then accumulate in
the pneumatic tool and be emitted via air outlet 4.
Use only the lubricants recommended by Bosch.
– SAE 10 mineral engine oil (for use at very cold ambient
conditions)
– SAE 20 mineral engine oil
Observe all applicable environmental regulations
when disposing of old grease and solvents.
Clean the pneumatic tool in regular intervals using com-
pressed air.
Action
– Open the drain valve.
– Fill lubricator with the recommended lubricants.
(See "Lubricating the Pneumatic Tool", page 15)
– Blow out the mechanism of the magazine/magazine
slider daily with compressed air.
– Blow out the mechanism of the discharge lock-off daily
with compressed air.
– Apply 2–3 drops of lubricant into air connector 6.
(See "Lubricating the Pneumatic Tool", page 15)
– Open the drain valve of the compressor tank.
1 609 929 Y30 | (16.8.12)