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Belive torque is bad need to know what port pressure is checked…

Belive torque is bad need...
Belive torque is bad need to know what port pressure is checked at and what the pressure is?
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Answered in 51 minutes by:
7/16/2015
Mechanic: dieseldan55, Mechanic replied 7 years ago
dieseldan55
dieseldan55, Mechanic
Category: Construction and Road Equipment
Satisfied Customers: 794
Experience: Road Mechanic for Volvo Construction Equipment.
Verified
Hello, what is the machine in question?
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Customer reply replied 7 years ago
It's a 446b cat backhoe. It is slow taking gear forward or rev also after warming up will stop all together. Need pressure spec. Found ports p-1 2 3 but did not see one for pump or torque
Mechanic: dieseldan55, Mechanic replied 7 years ago
Okay thanks for that information, I am a Volvo tech. I will opt out. and let a cat expert assist
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Mechanic: catmastertech, Technician replied 7 years ago
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,042
Experience: Field service technician for CAT 19 years.
Verified
Please post the full machine serial number and I will find the spec's for this transmission.
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Customer reply replied 7 years ago
Model 446b s/n 5bl00961 trans s/n 2ay00722. P-1 250 psi cold eng idle same at full rpm. P-2 225 psi same at idle or wo throttle after warp up about 5 min bouh drop to 50 psi in gear and in n at wo throttle 225 p-3 port -0- psi all the time. Unit still moves but has no drive power and will stop all together after short time
Customer reply replied 7 years ago
is anyone working on this???
Mechanic: catmastertech, Technician replied 7 years ago
Hello, I work out in the field during the day and answer questions here at night. I am working on your answer now.
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Mechanic: catmastertech, Technician replied 7 years ago
Problem 11b: Low pressure at pressure taps for P2 (speed and direction) clutches in all speeds and directions (5BL919-Up).Possible Causes:1. Modulating relief valve (12) stuck.2. Low oil pressure. See Problem: Transmission does not operate in any speed or slips in all speeds.3. Load piston springs (16) weak, damaged, or missing.4. Flow control valve (1) stuck open.5. Check valve (10) for the load piston is not closing (open to drain) or screen orifice (11) for the load piston is dirty (plugged).Problem 1: The transmission does not operate in any speed or slips in all speeds.Possible Causes:1. Transmission control fuse is open or blown.2. Problem in the electrical circuit (see Electrical Troubleshooting).3. Low system voltage.4. Transmission shift control unit (shift lever) is defective.5. Low oil pressure caused by:a. Low oil level.b. Restriction in the oil flow circuit such as a dirty oil strainer.c. Oil pump failure.d. Air leaks on the inlet side of the pump.e. Converter drive tangs worn or not engaged into the pump.f. Load piston relief valve (17) is stuck or has come apart.g. Leakage inside the transmission:Worn or damaged seal rings on the clutch shaft.Worn or damaged seals around the clutch piston.h. Modulating relief valve (12) stuck open.6. Torque converter failure.7. Mechanical failure in the transmission.8. Clutch discs and plates are worn too much.9. Transmission neutralizer switch is inoperative.10. Check valve (10) for the load piston is not closing (open to drain) or screen orifice (11) for the load piston is dirty (plugged).Problem 31: Low converter pressure.Possible Causes:1. Converter inlet relief valve (29) is stuck open.2. Low pump flow or pressure. See Problem: Transmission does not operate in any speed or slips in all speeds.This information is from a newer book and may cover your transmission better. If this is not correct, please let me know and I will check again.
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Customer reply replied 7 years ago
thanks, ***** ***** check some of them out tomorrow also I forgot about this when you put trans in high gear it seems to work better about taking gear when lower gear seem to wont to quit pulling
Mechanic: catmastertech, Technician replied 7 years ago
It still quits pulling no matter the gear selected when it warms up right?
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Customer reply replied 7 years ago
Yes it does let it cool down and it works short time again
Mechanic: catmastertech, Technician replied 7 years ago
If it is not the pump, you must have some serious leakage internally.
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Customer reply replied 7 years ago
Well that could be when it's cold trans is still weak I'm kind of thinking pump I'm going to check some valves and go from there
Mechanic: catmastertech, Technician replied 7 years ago
Ok, I have not repaired one of these transmissions so, I can't offer much for pointers.That is how I would begin but, a valve would usually be low all the time. Still it should be ruled out before pulling the whole unit.
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,042
Experience: Field service technician for CAT 19 years.
Verified
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catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,042
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