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case 1845c intermittent full throttle

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tightgtp

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Nov 8, 2009
Messages
94
Location
illinois
Occupation
lead service technician for the largest forklift c
i have a customer with a case 1845c. i have trouble getting full throttle out of it. i have adjusted the throttle stops but no help. evey now and then it will go to full throttle. i'm suspecting the injection pump. it has new fuel filters and air filters. i did check lift pump pressure and i was getting around 6psi running at full throttle.
 
Z

Z2898

Well-Known Member
Joined
Dec 18, 2009
Messages
143
Location
Canada
Sounds to me that the mechanical centrifugal governor is hanging up inside the pump. This can be a typical problem as the linkages and pins wear inside the pump over time.

Do you know many hours on the unit?
 
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tightgtp

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Joined
Nov 8, 2009
Messages
94
Location
illinois
Occupation
lead service technician for the largest forklift c
assuming its still the original motor and hasn't been rebuilt its around 12,500hrs.
 
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Z2898

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Dec 18, 2009
Messages
143
Location
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That is getting up there for sure.

Hate to tell you to get the pump rebuilt because that too can get expensive but it sure sounds like the problem to me.

With throttle linkage off the pump can you move the pump shaft through the full range from low to high idle by hand? Try this with engine running to eliminate a mechanical linkage from the cab hanging up. Sometimes that will happen.
 
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tightgtp

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Joined
Nov 8, 2009
Messages
94
Location
illinois
Occupation
lead service technician for the largest forklift c
yeah i've tried that. once i did all my previos testing i was pretty certain the pump is to blame
 
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Z2898

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Any smoke when your at high idle? You don't have a bad or slobbering injection adding to the lack of high idle?
 
T

tightgtp

Well-Known Member
Joined
Nov 8, 2009
Messages
94
Location
illinois
Occupation
lead service technician for the largest forklift c
no not really it seams to burn pretty clean. it runs good and smooth at idle or full
 
Z

Z2898

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Joined
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Messages
143
Location
Canada
Off the top of my head I don't know what else to suggest. Let me know what you find when you get the pump apart.
 
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