bjh101
Member
This is a pre 1995 unit with ford engine and standard controls as shown on page 3-34 and 3-35
2 years ago I had the same problem and replaced the inner parts and springs to the Main relief valve. pg 2-46 and 2-47
it still did no work with the new parts but then I cleaned out the hole and then all of a sudden it started to work. I thought there must have been a piece of dirt in the bottom.
Now it is doing it again I installed a pressure gauge on the control valve assembly. The symptoms are the same on the ground and in the basket. We removed the main relief valve and cleaned the hole 3 or 4 times. then all of a sudden it worked for about 5 minutes. I get about 400 psi when I hit telescope out and it will work. But when I try to telescope in the pressure does not go up. (When it was working correctly the pressure would go up to 2000)
I swapped relay R16 with R21 and I swapped R17 with R20. ( on R16 I have Brown-85, yellow -30, orange-87,org-red-86)
The wire to 87 is not shown on the wiring diagram on pa 3-34.
I have voltage to the bang bang dump valve but I did not measure the voltage yet.
2 years ago I had the same problem and replaced the inner parts and springs to the Main relief valve. pg 2-46 and 2-47
it still did no work with the new parts but then I cleaned out the hole and then all of a sudden it started to work. I thought there must have been a piece of dirt in the bottom.
Now it is doing it again I installed a pressure gauge on the control valve assembly. The symptoms are the same on the ground and in the basket. We removed the main relief valve and cleaned the hole 3 or 4 times. then all of a sudden it worked for about 5 minutes. I get about 400 psi when I hit telescope out and it will work. But when I try to telescope in the pressure does not go up. (When it was working correctly the pressure would go up to 2000)
I swapped relay R16 with R21 and I swapped R17 with R20. ( on R16 I have Brown-85, yellow -30, orange-87,org-red-86)
The wire to 87 is not shown on the wiring diagram on pa 3-34.
I have voltage to the bang bang dump valve but I did not measure the voltage yet.