cat backhoe 428d ride control sometimes doesnt work

Ride control in my backhoe sometimes work and sometimes not (most of the times not)... when i turn ride control button on sometimes the light will not illuminate ... and then i dont have ride control, indicator usually turn on after some time... it looks to me like it will work more often when engine is warm...) and sometimes works fine when i turn the switch on ... what is going on ? ... fuse are ok, my serial number is cat428d bmt02630

does anyone have a wiring diagram for this ? i dont know where to look for relay, sensor etc ?

cat backhoe 428d ride control sometimes doesnt work