cfd511 Posted May 12 Share Posted May 12 Hello all , have a 2000 mack rd 688 . I burned up the starter and replaced multiple times now . It seems the starter somehow is staying engaged and not releasing which is burning it up . Any of you guys have any ideas . Any idea what to test to find the problem Quote Link to comment https://www.bigmacktrucks.com/topic/75511-mack-start-issue/ Share on other sites More sharing options...
mrsmackpaul Posted May 12 Share Posted May 12 The wrong pinion on the starter motor The wrong clearance on the starter motor pinion to ring gear Ring gear is badly damaged in one spot and this binds on the pinion Starter shaft has no grease on it from new and is binding on the shaft Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75511-mack-start-issue/#findComment-575529 Share on other sites More sharing options...
fjh Posted May 12 Share Posted May 12 11 hours ago, cfd511 said: Hello all , have a 2000 mack rd 688 . I burned up the starter and replaced multiple times now . It seems the starter somehow is staying engaged and not releasing which is burning it up . Any of you guys have any ideas . Any idea what to test to find the problem Start solenoid on the fire wall sticking? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75511-mack-start-issue/#findComment-575536 Share on other sites More sharing options...
Joey Mack Posted May 12 Share Posted May 12 I have seen the relay stick a few times. fjh, is on to something. Ive even seen them crank the engine after shutting the door, as if there was something loose inside it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75511-mack-start-issue/#findComment-575537 Share on other sites More sharing options...
tjc transport Posted May 12 Share Posted May 12 I have seen it from both a bad solenoid, and also low voltage from bad batteries 1 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/75511-mack-start-issue/#findComment-575546 Share on other sites More sharing options...
Popular Post fjh Posted May 12 Popular Post Share Posted May 12 Good call Tjc low voltage is the enemy in most cases it can weld the solenoids ! If you got good crisp current it really makes starting much easier on the starter! 4 Quote Link to comment https://www.bigmacktrucks.com/topic/75511-mack-start-issue/#findComment-575557 Share on other sites More sharing options...
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