Lead Trailer Hydraulics

4 Hose Hydraulic:
Tractor: Contains all control valves
• 2 spool-open center- control valve OR (2) single spool- open center- control valves
• (2) on/off/on momentary switches to control dump cycle – one for each unit

Trailer:
• (2) sets of Hydraulic couplers on front nose of lead. Left side controls Lead, right side controls Pup.
• This is a very good system to decrease troubleshooting time. No controls on the trailers. If it doesn’t work, the problem is on the tractor.

Selector Valve:
Tractor:
• (1) single spool-open center- control valve
• (1) on/off/on momentary switch to control dump cycle
• (1) on/off locking switch to select lead or pup

Trailer:
• (1) set of hydraulic couplers on front nose of lead
• Hydraulic Selector valve mounted in Lead unit
o Selects which unit to send the pressure to- lead or pup
o Controlled with electric switch from cab, electric over air solenoid on lead trailer
o 7-way, 6-way or 4-way connection at front of Lead

Electric Valve w/power beyond
Tractor
• No Control Valve on Tractor
• (2) on/off/on momentary electric switches to control valves in trailers

Trailer:
• Electric over air switched single spool-open center-valve with power beyond in lead unit
• Electric over air switched single spool-open center-valve in pup unit
• 7-way, 6-way or 4-way connection at front of lead & jumper between lead and pup
• By-pass valve in frame of lead must be switched to circulate hydraulic oil from power beyond when pup is not hooked to lead unit

This set up minimizes the amount of valving needed on the tractor. This is useful if several different tractors will be pulling the unit.

Figure 1Lead unit/Power beyond

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