Understandings of Return-hoses
Classified by the function, return-hoses are divided into the three groups as follows;
- Leak-back return
Returns which came from oil-seals of cylinders & each oil-pleasure block. Even though the pressure is not so high, oil is leaking from Height-correctors continuously.
- Operational return
Discharge returns, which came after the each action by Oil-pressure blocks. Such as the time of return oil through the height-correctors after adjust the position in low and direction change by power assists staring wheel.
It is a group as for letting out the pressure changes inside of cylinder and/or cylinder boots. The pressure changes are caused by suspension cylinder work - expansion and contraction.
Classified by the assembly, return hoses are divided into three groups as follows;
- Octopus (familiar name: Knows as gathering return hoses)
The assembled three group hoses as follows:
- Leak-back from Front Rear height correctors, pressure regulators, Power cylinders and priority valve.
- Leak-back from front & rear suspension cylinders
- Ventilation from front suspension cylinders
- Breaks valve return
Leak-back return from break valve
- Operational return (High-pressure return)
Operational return from front & rear height correctors, Control valve
from Power-assist string and flow distributor.
- suction hose :the hose bails oil out toward high Pressure pump
- Operational return
- Breaks valve return
- Octopus: Group from Oil-pressure blocks
- Octopus: Front suspension cylinders
- Octopus: Air Ventilation
Octopus, Brake Valve return
Break valve return (c) and Octopus (D~F) run from Reservoir Tank toward
back from Engine-side,
Picture shows vehicle without Engine / Transmission. (At Auto Shop:
And goes along engine wall.(Left white arrow)
Below Height-corrector, you can see the Octopus body (describe later).
It connects the return-direction of Octopus body to leak-back of Right-Suspension cylinder.
Also Break-valve return runs under the Height corrector and go through
the vinyl-tube (center: white arrow)with hose from left-side of Octopus.
Tubes from left-side of sub-flame connect with Break-valve,
Priority-valve, Pressure-regulator and Left suspension-cylinder.
Operational-return(B) is ran toward engine front with suction hose.
Two hoses on Mark(white arrow) are came from both front & rear Height-correctors.
Divided two nearby flow distributor, connects each flow distributor, power-string-control valve.
For string line runs under the engine and transmission.
All of them are located in visible place, so you won't cause anxiety.
As describe before, Octopus consists:
- Front & rear height-corrector, Pressure regulator, Power cylinder,
Leak-back from Priority
- Leak-back from Front & Rear suspension cylinders
- ventilation from Front suspension cylinders.
White-line on the photo shows inside of the line.
It looks like three-line connection by rubber; it works connecting separately.
Red part is used 4mm, Blue-Green part is used 5mm plastic tubes and
connects each lines.。
The weakest part of Octopus is showed in X..
It turns over the upward and connects to Front Height-correctors ;thus,the part near the root easily crack and become continuousleaking. Difficult to repair, most annoying spot of leaking.
Front height-corrector has two Return-hoses.
Leak-back hose from Octopus group is shown photo(1).
Photo(2) with hose cramp is Operational-retrn. It seems cracking rarely for some unknown reason.
4-mm plastic tube comes to left-side of sub-flame, then being divided two between cramps by rubber-made T-joint (T) - one line runes to Priority valve (P) and another runs to Pressure regulator(R).
(C) is Leak-back from left Front suspension-cylinder and (B) is Brake valve return.
Located at left-back edge of front sub-flame.
Plastic tube of Above(P) connects rubber cap on the edge.
Brake valve return
Runs together with Octopus group to the left-edge of sub-flame and towards brake valve(red arrow).
In a case of exchange the Return-hose by official-dealer parts, it is easy to switch both Octopus and Brake valve return at the same time.
Hose exchange is simply take out and stick at the same point; however, both Height corrector and drive shaft prevent from working it.
Recommend to pull out right drive-shaft, if you are experienced.
(C) Y. Narabayashi
Translate: Taki Enomoto