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JLG 40H no proportional controls

B

BrownBear

Member
Joined
Jan 28, 2020
Messages
10
Location
Wawa, Ontario
Baby's first lift, a JLG 40H 1997 with Ford engine and 3 PQ Controls at the platform. s/n 047753030030541

All the ground controls and platform switch controls work as expected but none of the proportional controls does anything. PO says they worked intermittently and in certain positions before the lift was parked last year. Wiring appears intact and undisturbed. Any suggestions on where to start troubleshooting?
 
E

excavator

Senior Member
Joined
Oct 16, 2006
Messages
1,448
Location
Pacific North West
Check to make sure you're getting voltage to the proportional control dump valve. If I remember right it's located on the right side of the radiator area.
 
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