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  1. #1
    Member
    Join Date
    Jul 2011
    Posts
    35
    Location
    sunshine state
    Tractor
    JD855

    Default Briggs 21 hp vertical shaft question

    Hey everyone and HAPPY NEW YEAR!!
    My year is starting out with a dead b & s 21 hp pro series in a 42" deck BAD BOY ztr mower. The battery is 100% according to my charger, but it won't even click like a relay wasn't closing. It just clicks at the ignition. This mower sits out in the weather [in hot, humid south florida] and has had "stuck" seat interlock as well as parking lock problem. i spray those connections with electronic cleaner spray and it usually starts, until today. NOTHING. The mower is three years old; the motor is a model 33m777-0116-g1. the operators manual is not much help. is there a work around other than replacing switches?

    Any help or suggestions are greatly appreciated. THANKS!

  2. #2
    Gold Member
    Join Date
    Dec 2006
    Posts
    430
    Location
    Quebec
    Tractor
    Two Gravely Two L One with 10 h.p Dek-Diesel engine one Grillo 107d and one BCS 735 diesel

    Default Re: Briggs 21 hp vertical shaft question

    Hi! First Try to turn engine by hands if you can. If engine turn. Remove battery connectors at post Clean and remove all dirty as glaze .Connectors and posts must be brights. Bolts must be tights If nothing . Check all interlocks. Seat Pto Neutral switch etc..
    Be careful . Can be dangerous Put hand brake. May be you can to try start directly at starter from solenoid with screwdriver. If engine turn Starter is good. They are a process for check interlock switchs. We bypass the interlock by a test wire with two alligators . Good luck! Oldmech

  3. #3
    Member
    Join Date
    Jul 2011
    Posts
    35
    Location
    sunshine state
    Tractor
    JD855

    Default Re: Briggs 21 hp vertical shaft question

    Thanks oldmech!
    the motor turns by hand--i'm going to try the ols screwdriver jump in a little while. i'll let you know!

  4. #4
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    17,367
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Briggs 21 hp vertical shaft question

    With ign off, jump directly from the battery to the start lug on the starter. and see if the engine motors over.

    With switch on, do the same thing, and see if the engine starts.

    If the starter tries to turn, and does not, then the valves need to be re-set. You are building to much pressure for the starter to overcome the compression .
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    Gold Member
    Join Date
    Dec 2006
    Posts
    430
    Location
    Quebec
    Tractor
    Two Gravely Two L One with 10 h.p Dek-Diesel engine one Grillo 107d and one BCS 735 diesel

    Default Re: Briggs 21 hp vertical shaft question

    Hi! If you have Jump cable. Try boost battery with a good one . I think your tractor battery is over 3 years for these battery is old. A battery can have a good voltage but cannot turn engine. No amps .Good luck Oldmech

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