D6 Merv
Senior Member
- Joined
- May 10, 2007
- Messages
- 653
- Location
- Coromandel Peninsula. New Zealand
- Occupation
- Self employed bulldozing contractor with a D6D D4E
Most allis,s had a push start pump, you had to manually engage the pump that would provide oil to feed the control valve and select 2nd rev [this was on HD11 and 6] this gave drive pressure.
All AC converters had a overrunning sprag clutch; this was bloody good as it gave downhill braking. When the output shaft speed exceeded engine speed the cams and rollers locked up giving direct drive and this was how you could push start them.
Downside was it all made for a plumbing nightmare, especially when combined with ACs ground speed governor, which was just a bloody hard way of doing what we all do with a decelerator. Most people deleted all the push start and ground speed hyds, made them a lot easier to fix. But still difficult compared to cats simple layout like a D6
Incidently the early cat twin disc diesel torque converters also had the overrunning clutch; but cat bought out a product bulliten stating to remove them in the early 60s after the single stage oil converters became there standard p/s trans.
All AC converters had a overrunning sprag clutch; this was bloody good as it gave downhill braking. When the output shaft speed exceeded engine speed the cams and rollers locked up giving direct drive and this was how you could push start them.
Downside was it all made for a plumbing nightmare, especially when combined with ACs ground speed governor, which was just a bloody hard way of doing what we all do with a decelerator. Most people deleted all the push start and ground speed hyds, made them a lot easier to fix. But still difficult compared to cats simple layout like a D6
Incidently the early cat twin disc diesel torque converters also had the overrunning clutch; but cat bought out a product bulliten stating to remove them in the early 60s after the single stage oil converters became there standard p/s trans.
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