-
the pressure transmitter 3068GN.

 (4)
 LP Manifold

 -The LP manifold is the connection point for return lines from different parts ofthe LP system. It is attached directly to the system LP filter 3002GM.
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 D. Manifolds
 There are four manifolds in the system. They are:

 -
the HP manifold,

 -
the PTU manifold,

 -
the brake manifold,

 -
the LP manifold.

 All of the manifolds are aluminum castings. They are machined to make it possible to install different components on them. Some of the hydraulic connections between the manifolds and components are of the bobbin type (Ref. 29-00-00). Thus, replacement of components is possible with minimum effect on other components or pipes. The manifolds are drilled to make the internal connections between components.
 The following are the components installed on their related manifolds:
 (1)
 HP Manifold

 -
a solenoid valve,

 -
a check valve,

 -
the pressure relief valve 3063GM,

 -
the HP filter 3048GM,

 -
the check valve 3022GM,

 -
the sampling valve 3187GM,

 -
the pressure transmitter 3065GN (Ref. 29-32-00),

 -
the pressure switch 3151GN (Ref. 29-32-00),

 -
the pressure switch 10-CE-3 (Ref. 27-00-00).

 (2)
 PTU Manifold

 -
the priority valve 3064GM,

 -
the check valve 3093GM,

 -
a solenoid valve,

 -
a check valve

 (3)
 Brake Manifold

 -
the check valve 3058GM,

 -
the brake pressure relief valve 3067GM,

 -
the pressure transmitter 3068GN.

 (4)
 LP Manifold

 -The LP manifold is the connection point for return lines from different parts of the LP system. It is attached directly to the system LP filter 3002GM.
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 E. System Accumulator 3070GM The system accumulator 3070GM is the same as the system accumulator 1070GM installed in the Green hydraulic system (Ref. 29-11-00).
 F. Nitrogen Pressure Gage 3072GM The nitrogen pressure gage 3072GM is the same as the nitrogen pressure gage (1072GM) installed in the Green hydraulic system (Ref. 29-11-00).
 G. High Pressure (HP) filter 3048GM. The HP filter 3048GM is installed on the HP manifold. It is the same as the HP filter 1048GM installed in the Green hydraulic system (Ref. 29-11-00).
 H. Case Drain Filter 3084GM The case drain filter 3084GM is functionally the same as the HP filter 3048GM. The only differences are in its size and the configuration of the filter head.
 J. Low Pressure (LP) filter 3002GM The LP filter 3002GM is the same as the LP filter 1002GM installed in the Green hydraulic system (Ref. 29-11-00).
 K. Relief Valve 3063GM The relief valve 3063GM is installed on the HP manifold. It is the same as the relief valve 1063GM installed in the Green hydraulic system (Ref. 29-11-00).
 L. Brake Relief Valve 3067GM
R  (Ref. Fig. 014) The brake relief valve is installed on the brake manifold. It protects the parking brake system from overpressure and makes it possible to depressurize the brake system manually. The valve assembly has two main sections, a HP relief valve and a manual depressurization valve. A double cylindrical body contains the two valves and also has a flange to attach the assembly to the manifold. The hydraulic connections to the manifold are of the bobbin type (Ref. 29-00-00).

R  Brake Relief Valve Figure 014
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 The HP relief valve is a poppet type valve. Spring pressure holds the valve poppet against the valve seat. When hydraulic pressure increases to the crack pressure of the valve the force on the poppet is more than that from the spring. The valve opens and fluid flows from the inlet (port A) to the return (port B). When the hydraulic pressure decreases, the spring force is more than the hydraulic force and the valve closes. The valve opens at between 237 and 240 bar (3436 and 3480 psi), and closes when the pressure decreases to 220 bar (3190 psi).
 The manual depressurization valve is a ball valve. Hydraulic pressure from the inlet holds the ball on its seat and thus keeps the valve shut. A light spring pressure also holds the ball on its seat and is an anti-rattle device when there is zero pressure in the valve. Operation of the push-button lifts the ball off the valve seat. Hydraulic fluid can then flow from the inlet (port A) to the return (port B).
　
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