Maintenance And Service; Maintenance And Cleaning; Maintenance Schedule; Correction Of Malfunctions - Bosch GSN 90-21 RK Manual Original

OBJ_BUCH-1037-005.book Page 15 Monday, November 10, 2014 12:55 PM
– 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 ser-
vice agent for Bosch power tools.
– Empty the magazine 8.
(See "Emptying the Magazine", page 14)
– 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 14)

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.

Correction of Malfunctions

Problem
The pneumatic tool is ready for operation but no nails are dis-
charged.
Bosch Power Tools
– Loosen locking screw 21 (3 mm) with the supplied hex
key.
– 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 hex 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.
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 pneumat-
ic tool.
Reduces the wear of the pneumatic tool.
Prevents the accumulation of dirt/ debris and moisture in the
pneumatic tool.
Cause
A nail is jammed in the shot duct.
The magazine slider is 7 defective.
The spring of the magazine slider is too week or defective.
The fasteners being used are not permitted.
The magazine 8 is empty.
English | 15
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.

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.
 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.
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.
Corrective Measure
– Clear the jam.
(See "Clearing Jams", page 15)
– Clean and lubricate the magazine slider 7 as required
and make sure that the magazine 8 is not dirty/soiled.
– Contact an authorised service agent for Bosch power
tools.
Have the component replaced there.
– Use only original accessories.
Only the fasteners (nails, staples, etc.) specified in ta-
ble "Technical Data" may be used.
– Refill the magazine.
(See "Loading the Magazine", page 14)
1 609 92A 10Z | (10.11.14)