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Wayne
Wayne, Journeyman
Category: Construction and Road Equipment
Satisfied Customers: 9532
Experience:  worked on many road graders, Bull dozers , skid steers, Rollers
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I have a caterpillar 277b fuel problem cleaned tank changed

Customer Question

I have a caterpillar 277b fuel problem cleaned tank changed ignition switch and fuel pump fuel pump makes no noise once you put the safety bar down has power when up I put direct power to the pump to test and it runs fine
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Wayne replied 1 year ago.

Hi I'm Wayne

I see you been waiting awhile,

do you still need help with this

let me know

Customer: replied 1 year ago.
Expert:  Wayne replied 1 year ago.

Thank you for that

this sounds to me that the lap bar, has a faulty switch

or connection, I suggest remove it , and check the switch

Wayne

Customer: replied 1 year ago.
I can hear the pump running with safety lap bar up but when you put the bar down no power to the pump I put direct power to the pump with the lap bar down and it runs fine is the pump suppose to run all the time and is the switch just the two metal blocks on the right side of the lap bar how can I test does it control the fuel pump
Expert:  Wayne replied 1 year ago.

Hi

Yes that is it , it should have power too it all the time,

it will idle out of the seat, and lap bar down, continue to have power

check it with test light/volt meter for power

all the time

Customer: replied 1 year ago.
Ok I will check the switch and get back to you but the fuel pump should be running at all time correct and and the safety switch has a three prong connection and should have power also
Expert:  Wayne replied 1 year ago.

Hi

Yes that is all correct

Customer: replied 1 year ago.
Let me know about the fuel pimp should it be running the whole time so I can give you all the info I find
Expert:  Wayne replied 1 year ago.

Hi

Yes the fuel pump should run all the time,

at 1st click fast ,then to a slow click. ever second

Customer: replied 1 year ago.
I changed the lap bar switch same problem still . I raised the cab up in the air with the lap bar down the fuel pump is running. If I push down on the seat fuel pump does not run I unplugged the seat sensor and jumped across pump does not run it will start but will not run high rpm dies out put power to the pump runs great
Customer: replied 1 year ago.
What do I check next
Expert:  Wayne replied 1 year ago.

Morning

That is stranger one

so our problem is in the seat circuit

I suggest to check the wires from the switch

make sure they are not damaged,pinched

or worn thru

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