Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Landscaping & Lawn Care > Tractors & Mowers

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-03-2013, 08:12 AM   #1
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 26,203
Share |
Default

John Deere Z425


B&S 23 HP
Turn the key and 1/2 the time and it acts like it tries to turn over but does not fully crank.
Brand new battery, all terminals have been removed and cleaned.
New voltage regulator.
It does it whether the motor has been running or not.
Sometimes it just starts right up.
When it's running the charger is putting out 13.8 volts.
Only problem I've found so far is one of the fuses was burned up so I changed the fuse block and the fuse.
May have been caused by my trying to jump start it using my 50 amp. motor start position on my battery charger.
Once it does run it runs perfect, no smoke, no missing.
If I test just the battery it has just over 12 volts with nothing running.
If I put it on the charger a while it starts right up.
The solenoid does not click like a low battery when trying to crank over.
What do I check next?

__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
joecaption is online now   Reply With Quote
Old 11-03-2013, 08:18 AM   #2
bbo
Member
 
Join Date: Feb 2010
Location: Packerland !!
Posts: 1,016
Default

John Deere Z425


ouch, leaking current somewhere.

wiring harness? starter switch?

I'd be tempted to put a kill switch in there to disco the battery when not in use.

bbo is offline   Reply With Quote
Old 11-03-2013, 08:53 AM   #3
Member
 
chitownken's Avatar
 
Join Date: Nov 2012
Location: Will county, Illinois
Posts: 289
Default

John Deere Z425


Make sure it's DC, not AC. Had a shorted rectifier on B&S 16. Voltage was 14 when running but would not charge battery because was AC.
chitownken is offline   Reply With Quote
Old 11-04-2013, 08:47 AM   #4
Member
 
Join Date: Jul 2010
Posts: 1,731
Default

John Deere Z425


Granted, pretty unlikely, so will keep it short, but I had a similar problem with my Toro Proline a few years ago, which I finally chased down to the positive battery cable being pinched in a tight place. Wasn't damaged enough to be a problem every time, but enough to fry a couple of fuses by the time I sorted it out, and to drain the battery down a few times.
DexterII is offline   Reply With Quote
Old 11-06-2013, 04:12 AM   #5
Member
 
Join Date: May 2010
Location: South Florida
Posts: 44
Default

John Deere Z425


Many of the newer OHV BS engines both single and dual cylinder need the valves adjusted to prevent damage to the relay and or starter.
They are equipped with a compression release system. If the valves is slightly out of adjustment from wear the engine tries to start against its own compression.

Check it out.. many videos on line to how to adjust them.

Larry
S. Florida
Idmason60 is offline   Reply With Quote
The Following User Says Thank You to Idmason60 For This Useful Post:
kwikfishron (11-06-2013)
Old 11-06-2013, 06:32 AM   #6
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 26,203
Default

John Deere Z425


Quote:
Originally Posted by Idmason60 View Post
Many of the newer OHV BS engines both single and dual cylinder need the valves adjusted to prevent damage to the relay and or starter.
They are equipped with a compression release system. If the valves is slightly out of adjustment from wear the engine tries to start against its own compression.

Check it out.. many videos on line to how to adjust them.

Larry
S. Florida
Correct me if I'm wrong, but if the valves where out of adjustment it would do it every time and may even not run right once it did start.
It does not malfunction every time.
If it was a voltage lost it should be dead every time I tried to start it after it's been sitting over night and not start every time. 50% of the time it cranks right over.
All the wires are not touching anything from the solenoid to the battery and from the neg. to the frame.
Next time I use it and it messes up I'm going to try a jumper from the battery to the starter to see if it's the starter.
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
joecaption is online now   Reply With Quote
Old 11-06-2013, 07:01 AM   #7
Mod
 
kwikfishron's Avatar
 
Join Date: Mar 2010
Location: Kansas (NCK)
Posts: 7,294
Default

John Deere Z425


Quote:
Originally Posted by Idmason60 View Post
Many of the newer OHV BS engines both single and dual cylinder need the valves adjusted to prevent damage to the relay and or starter.
They are equipped with a compression release system. If the valves is slightly out of adjustment from wear the engine tries to start against its own compression.

Check it out.. many videos on line to how to adjust them.

Larry
S. Florida
That was my first thought as well. I've had the the same problem with a B&S too, same symptoms as Joe. It started out as an intermittent problem, pulled my hair out thinking it was electrical but it turned out to be the valves.
__________________
A Picture Is Worth A Thousand Words
Especially In The DIY Chatroom
kwikfishron is online now   Reply With Quote
Old 11-06-2013, 06:01 PM   #8
Member
 
Join Date: Sep 2012
Posts: 1,760
Default

John Deere Z425


A few minutes and at no cost for parts the valve clearances can be checked. The specs for your engine may be found in this link.

http://outdoorpowerinfo.com/engine_s...valve_gaps.asp

Another way to check is to put an amp meter on the starter cable. Normal cranking amps is around 150. If the compression is causing locked rotor the meter will top somewhere around 300 amps. That's all that starter is good for and most of the time jumping with a booster doesn't solve the problem and make it crank.


Last edited by Fairview; 11-06-2013 at 06:11 PM.
Fairview is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Brands of oil in John Deere SingleGuy Landscaping & Lawn Care 6 03-15-2012 01:45 PM
Stepping up to a rider. Which one? speedster1 Landscaping & Lawn Care 30 06-07-2011 09:51 AM
Zero Turn Mowers garback Landscaping & Lawn Care 16 04-11-2011 11:07 AM
John Deere ? redline Landscaping & Lawn Care 15 04-13-2009 06:03 PM
Skid Steer: Buy vs Rent DIY_JC Landscaping & Lawn Care 13 02-19-2009 09:26 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.