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Begin OCR Text:
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f8n 8peed . FA_ _oup____
The fan coupling function can be checked with a
stroboscope with variable blinking frequency. M8ke
a mark on the fan and one on the water pump pul-
Iey. Find out the speed relationship between fan
and pulley by means of the stroboscope. The fgn
speed should follow the speed of the water pump
, accord. ing to the curve given in Fig. 2-1O5.
__ 2OOO 3oOO _ 5ooo 6ooo
. __pu_ gpeed _.p._. (wa_e_ pu_p) y__L___8
Flg_ PlW_ Cu_e fo_ t__ _oupll_g _Ilp 2.53 ..
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