Impact Products Digital Concrete Test Hammer CN652 - Manual (Page 16)

6.2.2 Display Unit
• Check the surface of the outer sheath of the cable and the connector for
damage.
• Check the life of the batteries.
• If a battery life of 4 to 6 hours is indicated on the display unit, you should take a
new set of batteries to the measuring site.
6.3 Storage
• Store the concrete tester and accessories in the original case in a clean, dust-
free room.
• If the unit is not used for a long period of time, remove the batteries.
6.4 Maintenance
We recommend checking the concrete test hammer for wear after 2 years at
most and clean it. Do this as described below.
The concrete test hammer can either be sent to a service center
authorized by the vendor or else it can be maintained by the operator according
to the following description.
The items in (brackets) are illustrated in Fig. 6.2, ”Lengthways
section through the concrete test hammer”.
6.4.1 Stripping Down
Warning!
Never strip down, adjust or clean the slider and guide rod (4) (see Fig. 6.2),
otherwise the slider friction may change. Special tools are required to readjust it.
• Position the concrete test hammer perpendicular to the surface.
Danger!
The impact plunger (1) generates a recoil when it deploys. Therefore
always hold the concrete test hammer with both hands!
Always direct the impact plunger (1) against a hard surface!
• Deploy the impact plunger (1) by pushing the concrete test hammer towards the
surface until the push button (6) springs out.
• Unscrew the cap (9) and remove the two-part ring (10).
• Unscrew the rear cover (11) and remove the compression spring (12).
• Press the pawl (13) and pull the system vertically up and out of the housing (3).
• Lightly strike the impact plunger (1) with the hammer mass (14) to release the
impact plunger (1) from the hammer guide bar (7). The retaining spring (15)
comes free.
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