Main Manifold Valve - Alto ATS 46 Troubleshooting Manual

The ATS 46/53 hydraulic main manifold valve contains the hydraulic control valves for the main broom
sweeping, scrubbing, and hopper lifting systems. The following description outlines the function of each
cartridge valve in this manifold.
The ATS 46/53 main manifold valve contains three (3) solenoid valves, one (1) priority flow divider
valve, and one (1) relief valve. The solenoid valves are designated SV1, SV2, and SV3, the priority flow divider
valve is designated FR1, and the relief valve is designated RV1.
FR1 This priority flow divider valve divides and directs the incoming auxiliary pump flow entering the
manifold at port "P". (P/N 7-12-02001)
Since FR1 is a 0.75 gpm valve, it directs 0.75 gpm from the supply oil entering port "P" out port "P1"
to the cylinder control manifold valve. The remainder of the supply oil over and above 0.75 gpm
(bypass oil) is directed to SV1. FR1 is a priority valve which means that the 0.75 gpm must be satis
fied before oil is permitted to bypass to SV1. This explains why the side broom, scrub deck cylinder,
and squeegee cylinder function at normal speed regardless of engine speed (pump flow).
SV1 This 2-position, 2-way poppet solenoid valve directs the bypass oil from FR1. (P/N 7-12-02003)
When SV1 is not energized, SV1 is open and allows bypass oil from FR1 to flow to SV2. This is the
main broom and dust control "OFF" position.
When SV1 is energized, SV1 is closed and the direct path to SV2 is blocked. Bypass oil flows from
FR1 out port "1" to the main broom and dust control motors. This is the main broom and dust control
"ON" position.
SV2 This 2-position, 2-way poppet solenoid valve is identical to SV1 and directs the oil returning through
port "2" or the oil flowing through SV1. (P/N 7-12-02003)
When SV2 is not energized, SV2 is open and allows oil from either SV1 (if the sweeping system is off)
or port "2" (if the sweeping system is on) to flow through port "T". This is the scrub brush "OFF"
position.
When SV2 is energized, SV2 is closed and the direct path to port "T" is blocked. Oil flows from either
SV1 or port "2" to SV3. This is the scrub brush "ON" position.
SV3 This 2-position, 4-way solenoid spool valve directs the oil leaving SV1 or port "2" when SV2 is ener
gized and determines which direction the scrub brushes rotate. (P/N 7-12-02004)
When SV3 is not energized, oil from SV1 (if sweeping system is off) or port "2" (If sweeping system is
on) is directed through port "3" to the scrub brush motors. The return oil from the scrub brush motors
flows through port "4" and is directed by SV3 to port "T". This results in the "normal" scrub brush
direction of rotation.
When SV3 is energized, oil from SV1 or port "2" is directed through port "4" to the scrub brush motors.
The return oil from the scrub brush motors flows through port "3" and is directed by SV3 to port "T".
American-Lincoln Technology
ATS 46/53 Troubleshooting Guide

MAIN MANIFOLD VALVE (7-88-00074)

INTRODUCTION
DESCRIPTION
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