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AUXILIARY MANIFOLD (8-88-00055)
The 3366 hydraulic main manifold valve contains the hydraulic control valves for the power steering,
dumping, sweeping, and dust control systems. The following description outlines the function of each cartridge
valve in this manifold.
The 3366 auxiliary manifold valve contains two (2) priority divider valves, one (1) solenoid valve and
three (3) relief valves. The priority flow divider valves are designated FR1, FR2; the solenoid valve is desig-
nated SV1; the relief valves are designated RV1, RV2, and RV3.
FR1
This priority flow divider valve divides and directs the incoming auxiliary pump flow entering the
manifold at port "P". (P/N 7-12-02020)
Since FR1 is a 2.0 gpm valve, it directs 2.0 gpm from the supply oil entering port "P" out port "S" to the
steering control unit. The remainder of the supply oil over and above 2.0 gpm (bypass oil) is directed
to FR2. FR1 is a priority valve which means that the 2.0 gpm must be satisfied before oil is permitted
to bypass to FR2. This explains why the power steering functions smoothly regardless of engine
speed (pump supply) and also why the main broom and dust control fan do not function at the low idle
speed.
FR2
This priority flow divider valve divides and directs the bypass flow from FR1. (P/N 7-12-02009)
Since FR2 is a 1.0 gpm valve, it directs 1.0 gpm from the bypass oil leaving FR1 out port "H" to the
hopper control valve. The remainder of the bypass oil from FR1, over and above 1.0 gpm (bypass oil),
is directed to SV1. FR2 is a priority valve as well therefore the 1.0 gpm must be satisfied before oil is
permitted to bypass to SV1.
SV1
This 2-position, 2-way poppet solenoid valve directs the bypass oil from FR2. (P/N 7-12-02012)
When SV1 is not energized, SV1 is open and allows bypass oil from FR2 to flow through port "T" and
back to the return manifold.
When SV1 is energized, SV1 is closed and the path to port "T" is blocked. Bypass oil flows from
FR2 out port "B" to the dust control motor and main broom motor.
RV1
This poppet style relief valve limits the pressure of the oil leaving the manifold at port "H". It serves
to protect the auxiliary pump, the hopper control valve, the hopper cylinders, and the side broom
motor. (P/N 7-12-02010)
Under normal operation, oil pressure in the hopper dump and side broom system remains below 2,300
PSI and RV1 remains closed. When 2,300 PSI is achieved at port "H", RV1 opens and permits oil to
flow directly to port "T" and back to the return manifold. This condition will typically occur under the
following conditions: the hopper is returned against the stops; the hopper is rotated all the way around;
the hopper is filled all the way up; the hopper load exceeds 2,000 lbs; or the side broom is stalled
against an obstruction.
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INTRODUCTION
DESCRIPTION
American-Lincoln Technology
3366XP Troubleshooting Guide
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