P.t.o engages then disengages?

Hi I have a daf cf85 2004 automatic transmission grab loader.
When I depress p.t.o switch in cab, p.t.o engages, revs go up as normal, then after a brief second of revs going up, the p.t.o cuts out.
Checked all fuses and for air leaks.
R.D Grabs, October 2013


done
Probably a faulty confirmation switch

norb, October 2013
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