WD-45 starter switch?
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=45281
Printed Date: 18 Jul 2025 at 7:27am
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Topic: WD-45 starter switch?
Posted By: mdm1
Subject: WD-45 starter switch?
Date Posted: 09 Feb 2012 at 6:40pm
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Is there any way to check and see if a starter switch is making contact with the starter terminal? It is a fairly new switch but you always had to pull on the starter rod enough to make your fingers hurt. I cleaned all the connections thinking that maybe was the problem. Sometimes the starter would engage sometimes not. I have all new cables of the correct size and a good ground. When I went to tighten the cable from the battery to the switch I bumped the rod and got a spark. Now I have nothing. The starter is good the battery has full charge but if I hook a battery to the switch terminal and press the switch nothing. Could the terminal on the starter be worn? It doesn't look like it. I think I may just have a bad switch that doesn't make contact. Sorry about the length of this post. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Replies:
Posted By: 79fordblake
Date Posted: 09 Feb 2012 at 7:10pm
| May be as simple as removing the switch and sanding the contacts unless it is worn. |
Posted By: Steve in NJ
Date Posted: 09 Feb 2012 at 7:17pm
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If you're referring to the cam operated plunger switch, remove the two screws that hold the switch to the starter motor and remove the switch. It sounds like the contact wedge on the bottom of the switch has a burned spot in it and contact is broken. Depending on the switch mfr., some mfr's. use a jam nut to hold the contact wedge/stud in place, some use a staked load washer. If equipped with a jam nut, loosen the jam nut and back off till you can rotate the contact wedge/stud 180 degrees. This will give you a new contact edge for the plunger block. If a staked load washer is present, take a channel locks pliers and gently rotate the contact wedge around the same as the jam nut style. This will give you a new contact area again. Low Voltage to the contact block is what usually starts the wedge to burn. After re-installing the switch, you should be good to go! Steve@B&B |
Posted By: CTuckerNWIL
Date Posted: 09 Feb 2012 at 7:30pm
1. Yes, remove it from the starter and inspect the contacts. PLEASE read number 2. first. There is a "nub" on the starter and one on the switch with the battery connection post on it. These 2 "nubs" are mechanically connected when you pull on the switch. Many times these "nubs" gets hollowed out and things don't make good contact. All four sides of the connections can be filed flat to make better contact. Things have to stay parallel also. 2. NEVER put a wrench on any electrical connection without removing the ground cable form the battery first. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
mdm1 wrote:Posted By: CTuckerNWIL
Date Posted: 09 Feb 2012 at 7:34pm
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I think most of the replacement switches are also JUNK made in China or some such place.
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: mdm1
Date Posted: 10 Feb 2012 at 5:44am
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I sanded and cleaned the contacts. I will spin the contact. I did notice the battery cable nub was twisted just a tad, maybe when I tightened the nut so may I wasn't getting good contact. It is a fairly new switch. Where is a good place to buy a switch? I do believe this one came from a forum member.As far as number 2, I knew better but thanks for the reminder. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: mdm1
Date Posted: 10 Feb 2012 at 6:20am
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I filed the nub on the starter and used a battery jumper and it works. Thanks for the help. Now to put it in the tractor which is 2 hours away. ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |
Posted By: Steve in NJ
Date Posted: 10 Feb 2012 at 8:04am
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We still have a quality switch in stock yet. Gettin' down to the bottom of the barrel of the quality switches, but still have some if you need one....
mailto:Steve@B&B" rel="nofollow - Steve@B&B
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Posted By: mdm1
Date Posted: 10 Feb 2012 at 4:43pm
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Steve I sent you a PM ------------- Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK! |