glow plugs for 721D ???

Dumb brainfart-type question, but does the 721D diesel engine utilize "traditional" glow plugs to start? I wonder because I cannot see a 120v grounded plug to pre-heat them, like I used to have on my diesel truck. If this mower does use glowplugs then it may be time to get new ones... I tried to start it a week ago when it was really cold and got nothing. Everything else was good to go but she wouldn't start. That makes this tractor worhtless to me as is, since I intend to be ready to throw some snow if we get another winter like last year.



Thanks.

JN