Alto 3366 User manual

AMERICAN-LINCOLN
TECHNOLOGY
Hydraulic
Troubleshooting Guide
3366/3366XP
POWER SWEEPER
Beginning with Serial No. 585063
Part no. 2-86-00161 1996 American-Lincoln Technology Printed in the U.S.A.
UL
®
ISO 9001
FILE A2287
#

American-LincolnTechnology 1-1
3366XPTroubleshooting Guide
TABLE OF CONTENTS
INTRODUCTION & SAFETY PRECAUTIONS ......................................................................................1-2
BASIC HYDRAULICS ............................................................................................................................ 1-3
NORMAL OPERATING SPEEDS, PRESSURES, & FLOWS ............................................................... 1-4
TROUBLESHOOTING EQUIPMENT.....................................................................................................1-5
AUXILIARY MANIFOLD......................................................................................................................... 1-6
COMPONENT DESCRIPTIONS & FUNCTIONS ...................................................................................1-8
HYDROSTATIC PROPULSION PUMP ............................................................................................1-8
AUXILIARY PUMP ...........................................................................................................................1-8
REAR WHEEL MOTOR ................................................................................................................... 1-9
AUXILIARY MANIFOLD ...................................................................................................................1-9
BROOM & FAN SOLENOID VALVE................................................................................................. 1-10
FAN (IMPELLER) MOTOR...............................................................................................................1-10
WET SWEEP BYPASS SOLENOID (OPTIONAL) ........................................................................... 1-10
MAIN BROOM MOTOR ................................................................................................................... 1-10
OIL COOLER ...................................................................................................................................1-11
HOPPER CONTROL VALVE (LOW DUMP) ....................................................................................1-11
HOPPER CONTROL VALVE (VARIABLE DUMP)............................................................................1-12
SIDE BROOM MOTOR....................................................................................................................1-12
SIDE BROOM MOTOR SHUTOFF VALVE ......................................................................................1-12
LEFT SIDE BROOM MOTOR (OPTIONAL).....................................................................................1-13
DUMP CYLINDERS (LOW DUMP) .................................................................................................. 1-13
ROTATION & DUMP CYLINDERS (VARIABLE DUMP) ................................................................... 1-14
HOPPER LOCKOUT SOLENOID VALVE (VARIABLE DUMP) ........................................................1-14
LIFT CYLINDERS (VARIABLE DUMP) ............................................................................................1-14
RESERVOIR ....................................................................................................................................1-15
RETURN FILTER .............................................................................................................................1-15
HYDRAULIC OIL..............................................................................................................................1-15
STEERING CONTROL VALVE ........................................................................................................1-15
STEERING CYLINDER....................................................................................................................1-15
HYDRAULIC & ELECTRICAL SCHEMATICS ........................................................................................ 1-16
3366 VARIABLE DUMP ...................................................................................................................1-16
3366 LOW DUMP ............................................................................................................................1-17
3366 FORD 413 ENGINE ................................................................................................................1-18
3366 FORD 425 ENGINE ................................................................................................................1-19
3366 PERKINS 104.19 ENGINE ...................................................................................................... 1-20
SERVICE PARTS ...................................................................................................................................1-21
TROUBLESHOOTING TABLE .............................................................................................................. 1-22

1-2 American-LincolnTechnology
3366XP Troubleshooting Guide
The purpose of this guide is to provide a resource for technician training, troubleshooting, and compo-
nent repair of the Model 3366 hydraulic system. The guide is written for use by the experienced technician who
isknowledgeableinmobile hydraulics and familiar with mobile industrialsweepers andscrubbers.
WARNING
For safety, observe the following warnings, failure to comply may create a serious risk of injury to yourself and
others. This machine should not be used in hazardous locations including areas of volatile dust or vapor concen-
trations.
1. To avoid possible injury of property damage, read the operator’s manual before using the machine.
2. Fire hazard. Fine dusts, fuels, solvents, and thinners can explode and cause severe burns.
3. Do not use with or near flammable materials and vapors. Use only with good ventilation.
4. Heavy machinery. Improper use can cause injury.
5. Operate only from the designated operator’s position. Keep inside the body of the machine.
6. Do not leave the machine on a ramp or dock. After stopping the machine, turn all the switches off.
7. Do not dump the hopper over an open pit or dock. Do not dump the hopper when positioned on a grade
(ramp). The machine must be level (horizontal).
8. Operate only when lids, doors, and access panels are securely closed.
9. Never travel with the hopper in the raised position.
10. The operator must exhibit extreme caution when negotiating, turning, and traveling across grades or
ramps.
11. Start, stop, change direction, travel, and brake smoothly. Slow down when turning. Avoid uneven surfaces
and loose materials.
12. Watch out for obstructions, especially overhead.
13. Carry no passengers on the machine.
14. Set parking brake whenever leaving the machine. Chock (block) the wheels if the machine is to be parked
on a grade (ramp), or is to be worked on.
15. Never leave the operator’s seat with the engine running.
16. Report damage or faulty operation immediately. Do not operate the machine until repairs have been
completed.
17. Maintenance and repairs must be done by authorized personnel only.
WARNING
To maintain the stability of this sweeper/scrubber in normal operation, the counterweights, overhead guard, rear
bumper guard, or any similar equipment, installed by the manufacturer as original equipment, should never be
removed. If it becomes necessary to remove such equipment for repair or maintenance, this equipment must be
reinstalled before the sweeper/scrubber is placed back in operation.
INTRODUCTION & SAFETY PRECAUTIONS

American-LincolnTechnology 1-3
3366XPTroubleshooting Guide
The four basic concepts of hydraulics are pressure, flow rate, pressure drop, and efficiency. Agood
understanding of these concepts and a working knowledge of hydraulic components provide the necessary
tools for successful hydraulic troubleshooting.
Pressure - Pressure is defines as force applied over a surface and is measured as force per unit area
(pounds/square inch or PSI). Hydraulic oil is an incompressible fluid, unlike air, therefore a force applied
to an area of oil is transmitted throughout the fluid.
Flow Rate - Flow rate is defined as volume transferred over a period of time and is measured as volume
per unit of time (gallons/minute or GPM). The flow rate of hydraulic oil determines the speed of hydraulic
components including motors and cylinders.
Pressure Drop - Pressure drop is a decrease in pressure from one point to another in a hydraulic circuit.
Pressure drop occurs when hydraulic oil does work, such as: creating heat due to friction and flow through
restrictions, hoses, valves, cylinders, pumps, and motors; transmitting torque through hydraulic motors to
rotating devices, and moving masses with hydraulic cylinders. From a measurement of flow and pressure
drop between two points in a hydraulic circuit, the amount of power used between these points may be
determined.
Efficiency - Efficiency is a measure of actual performance compared to theoretical performance. Efficien
cies are measured in percentages. In hydraulics, three types of efficiency are measured including: volu
metric, mechanical, and overall.
Volumetric efficiency is necessary to calculate output flow rates of pumps and speeds of hydraulic motors and
cylinders. For pumps and motors, volumetric efficiency indicates the amount of internal leakage between
pressure and suction and case drain flow. Volumetric efficiency typically decreases with an increase in pres-
sure.
Mechanical efficiency is necessary to calculate actual pressure output of pumps and torque output of hydraulic
motors. Mechanical efficiency indicates energy wasted due to friction between shafts, bearings, seals, seal
plates, and other mechanical components of pumps and motors.
Overall efficiency is necessary to calculate actual power required to operate a pump or motor. Overall effi-
ciency is the product of volumetric and mechanical efficiency.
BASIC HYDRAULICS

1-4 American-LincolnTechnology
3366XP Troubleshooting Guide
NORMAL OPERATING SPEEDS, PRESSURES, & FLOWS
System Characteristic Operating Condition Specification
Full Throttle @ No Load
Full Throttle Loaded
2600 ± 50 RPM
24500 RPM MIN
Engine Speed
Wheel Drive Motor
Speed
Full Pedal Forward @ No Load
Full Pedal Reverse @ No Load
130 ± 10 RPM
50 RPM MIN
Broom On, Up Position
Broom On, Sweep Position
Broom On, Float Position
450± 50 RPM
425 ± 50 RPM
400 ± 50 RPM
Main Broom Speed
Vacuum Fan Speed 6000 ± 500 RPM
Side Broom Speed Down Position 150 ± 10 RPM
Auxiliary Pump
Pressure
Main Broom On in Up Position
Main Broom On in Float Position
Side Broom Down
Empty Hopper Lift
Hopper Return Against Frame
Main Broom On in Sweep Position
1000 ± 150 PSI
1100 ± 150 PSI
1300 ± 150 PSI
350 ± 50 PSI
1350 ± 200 PSI
2300 ± 50 PSI
Hydrostatic Drive Pump
Pressure
Normal Acceleration
Full Pedal freewheeling Forward
Continuous Sweeping/Scrubbing Speed
2000 PSI Spike
350 ± 50 PSI
600 ± 50 PSI
Auxiliary Pump
Output High Throttle 12.5 ± -0.5 GPM
Hydrostatic Piston
Pump Output High Throttle, Full Forward, No Load 13.2 ± -0.5 GPM
Hopper Cylinder Cycle
Speed
Vari-Dump Rotate & Dump Cycle
Vari-Dump Lift Cycle
Vari-Dump Return Cycle from Max Lift &
Dump
Low Dump Dump Cycle
Low-Dump Return Cycle
33 ± 7 SEC
13 ± 3 SEC
16 ± 4 SEC
22 ±-5 SEC
16 ± 4 SEC

American-LincolnTechnology 1-5
3366XPTroubleshooting Guide
The ability to isolate and identify problems in a hydraulic system is greatly improved with the use of
accurate troubleshooting equipment. The recommended equipment for troubleshooting the 3366 sweeper
includes:
1. Hydraulic Pressure Gauge (0 to 3000 PSI Range)
LHA model PGL-25-3000-S or equivalent
2. Photo Tachometer (0 to 15000 RPM Range)
EXTECH modelAC461893 or equivalent
3. Reflective Tape (for use with photo tachometer)
EXTECH modelAC461935 or equivalent
4. Flowmeter (0.5 to 4 GPM Range)
HEDLAND model 600-004 or equivalent
5. Flowmeter (1.0 to 15 GPM Range)
HEDLAND model 600-015 or equivalent
6. Adapter O-ring face seal “T” fittings, reducers,
caps and plugs
7. Digital Multimeter (Electrical)
FLUKE model 8024B or equivalent
American-Lincoln Kit P/N 0880-419 is available and includes: 0 to 3000 PSI hydraulic pressure gauge, #8
and #4 O-ring face seal “T” adapters, gauge hose, gauge-to-gauge adapters and a #8 to #4 O-ring face seal
reducer.
TROUBLESHOOTING EQUIPMENT

1-6 American-LincolnTechnology
3366XP Troubleshooting Guide
AUXILIARY MANIFOLD (8-88-00055)
INTRODUCTION
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.
DESCRIPTION
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.

American-LincolnTechnology 1-7
3366XPTroubleshooting Guide
RV2 This poppet style relief valve limits the pressure of the oil leaving the manifold at port “S”. It serves to
protect the auxiliary pump and the steering control unit. (P/N 7-12-02021)
Under normal operation, oil pressure in the steering system remains below 1,000 PSI and RV1
remains closed. When 1,000 PSI is achieved at port “S”, RV1 opens and permits oil to flow directly to
port “T” and back to the return manifold. This condition will typically occur when the steering wheel is
turned to the full righthand or lefthand stops.
RV3 This poppet style relief valve limits the pressure of the oil leaving the manifold at port “B”. It serves to
protect the auxiliary pump, the dust control motor and the main broom motor (P/M 7-12-02010)
Under normal operation, oil pressure in the sweeping/dust control system remains below 2,300 PSI
and RV3 remains closed. When 2,300 PSI is achieved at port “B”, RV3 opens and permits oil to flow
directly to port “T” and back to return manifold. This condition will typically occur when the main broom
is stalled against an obstruction.
T-0080
SV
SV
RV1
RV1
RV2
RV2
FR2
FR2
FR1
FR1
RV3
RV3
5
6
8-88-00055
T
HB
SP
AUXILIARY
MANIFOLD
2300 PSI
B
S
T
H
P
t0080a
AUXILIARY MANIFOLD (8-88-00055)

1-8 American-LincolnTechnology
3366XP Troubleshooting Guide
COMPONENT DESCRIPTION & FUNCTION
The following section contains the description of the type of each hydraulic component included in the
Model 3366/3366XP Sweeper hydraulic system. The item numbers found in the description refer to the
corresponding schematic symbols of the hydraulic schematic diagrams located in Section III and also to the
table of components and their respective service parts located in Section VI.
Hydrostatic Propulsion Pump (item 1): This engine drive variable displacement piston pump provides
hydraulic power to the hydraulic wheel motor. The accelerator and directional control pedal controls
forward and reverse motion of the wheel motor by mechanically varying the flow rate and direction of the
pump’s output (See Figure 1).
The propulsion pump and drive motor are a part of the closed-loop hydraulic circuit. Since minimal internal
leakage is required to lubricate the rotating parts of the pump and motor, a small makeup pump is built
into the propulsion pump to keep the closed-loop circuit fully charged.
T-0070
T0070 Figure 1
Auxiliary Pump (Item 2): This engine drive gear pump is mounted to the rear of the hydrostatic propulsion
pump. It provides hydraulic power to the main broom and fan, side broom, rotation cylinder, dump cylin
der, lift cylinders, and optional power assist steering (see Figure 2). The auxiliary pump draws oil from the
reservoir through the suction strainer (Item 3) and supplies pressurized oil to port “P” of the auxiliary
manifold.
T-0071
T0071 Figure 2

American-LincolnTechnology 1-9
3366XPTroubleshooting Guide
COMPONENT DESCRIPTION & FUNCTION
Rear Wheel Motor (Item 4): The disc valve motor is hydraulically driven by the propulsion pump. The drive
wheel is mounted directly to the motor to provide forward and reverse machine motion (See Figure 3).
Hydraulic braking is possible with this pump and motor combination. Since the hydraulic drive circuit is
closed-loop, the position of the control pedal corresponds directly to the wheel speed and direction.
Auxiliary Manifold (Item 5): This manifold receives the pressurized output oil from the auxiliary pump
through port “P” and distributes it to the steering control valve and to either the fan and broom motors or
the reservoir (See Figure 4). The manifold contains two flow divider cartridge valves, three relief valves
and the broom and fan solenoid cartridge valve (See Figure 4).
The first flow divider cartridge diverts 2.0 gpm of pressurized oil through port “S” to the “P” port of the
steering control valve. The second flow divider cartridge diverts 1.0 gpm of pressurized oil through port
“H” to the “IN” port of the cylinder control valve. The three relief valves protect the auxiliary pump by
limiting the pressure of the oil at ports “S”, “H””, and “B” respectively. When pressure reaches the relief
settings of each valve, relieved oil flows through port “T” back to the reservoir. The broom and fan sole
noid valve controls the second flow divider bypass oil (See broom and fan solenoid valve).
T-0072
T0072 Figure 3
T-0080
SV
SV
RV1
RV1
RV2
RV2
FR2
FR2
FR1
FR1
RV3
RV3
5
6
8-88-00055
T
HB
SP
T0080 Figure 4

1-10 American-LincolnTechnology
3366XP Troubleshooting Guide
Broom and Fan Solenoid Valve (Item 6): This two-way poppet-style normally open solenoid cartridge valve
located in the auxiliary manifold controls the main broom and fan motor pressurized oil supply. The
solenoid is energized when the broom and fan switch on the instrument panel is activated, the shaker
motor switch on the instrument panel is deactivated and the hopper switch is in the closed position.
When the broom and fan solenoid valve is energized, the second flow divider bypass is directed to the
broom and fan motors through port “B”. When the broom and fan solenoid valve is de-energized, the
second flow divider bypass returns to the reservoir through port “T”.
Fan (Impeller) Motor (Item 7): This gear motor is hydraulically driven by pressurized oil leaving the auxiliary
manifold through port “B” (See Figure 5). It operates whenever the broom and fan switch on the instru
ment panel is activated, the shaker motor switch on the instrument panel is deactivated and the hopper
switch is in the closed position.
Wet Sweep Bypass Solenoid (Item 8): This two-way poppet-style normally closed solenoid valve is activated
by the wet sweep bypass switch on the instrument panel. When the wet sweep bypass switch is activated,
the solenoid is energized to open the valve and permit flow to bypass the fan motor.
Main Broom Motor (Item 9): This motor is hydraulically driven by the fan motor return flow or bypass flow
(wet sweep bypass option only). It operates whenever the broom and fan motor switch on the instrument
panel is activated, the shaker motor switch on the instrument panel is deactivated and the hopper switch is
in the closed position (See Figure 6). On the machines with the wet sweep bypass option, the auxiliary
pump operating pressure will vary based on the position of the wet sweep bypass switch since the main
broom motor and the fan motor are in series and the wet sweep bypass valve is in parallel with the fan
motor.
COMPONENT DESCRIPTION & FUNCTION
T-0074
T0074 Figure 5
T-0075
T0075 Figure 6

American-LincolnTechnology 1-11
3366XPTroubleshooting Guide
COMPONENT DESCRIPTION & FUNCTION
Oil Cooler (Item 10): The oil cooler is located on the operator’s side of the engine radiator. It dissipates heat
from the main broom return oil to maintain an acceptable hydraulic system oil temperature (See Figure 7).
Hopper Control Valve (Low Dump) (Item 11): This hand activated directional spool valve directs the priority
oil leaving port “R” of the auxiliary manifold (See Figure 8). With the valve lever in the center position, oil
flows through the “IN” port and out the “BYD” port to the side broom motor and side broom bypass valve
while ports “A” and “B” are blocked. With the hopper dump lever in the “DUMP” position, oil flows through
the “IN” port and out the “A” port to the base end of the dump cylinders. Return oil from the dump cylin
ders flows through the “B” port and out the “OUT” port back to the reservoir.
With the hopper dump lever in the “RETURN” position, oil flows through the “IN” port and out the “B” port
to the rod end of the dump cylinders. Return oil from the dump cylinders flows through the “A” port and out
the “OUT” port back to the reservoir.
T-0076
T0076 Figure 7
T-0077
T0077 Figure 8

1-12 American-LincolnTechnology
3366XP Troubleshooting Guide
Hopper Control Valve (Variable Dump) (Item 12): This hand activated directional twin-spool valve directs
the secondary priority oil leaving port “H” of the auxiliary manifold (See Figure 9). With the dump and lift
levers in the center position, oil flows through the “IN” port and out the “BYD” port to the side broom motor
and side broom bypass while ports “A”, “B”, “C”, and “D” are blocked.
With the dump lever in “DUMP” position, oil flows through the “IN” port and out the “A” port to the base end
of the dump and rotate cylinders. Return oil from the dump cylinder flows through the “B” port and out the
“OUT” port back to the reservoir.
With he dump lever in the “RETURN” position, oil flows through the “IN” port and out the “B” port to the
rod end of the dump cylinder. Return oil from the dump and rotation cylinders flows through the “A” port
and out the “OUT” port back to the reservoir. With the lift lever in the “RAISE” position, oil flows through
the “IN” port and out the “D” port to the base end of the lift cylinders.
With the lift cylinders in the “LOWER” position, oil flows through the “IN” port and out the “C” port to the
reservoir. At the same time, oil in the base end of the lift cylinders flows back through port “D” and is
directed to the “OUT” port back to the reservoir.
Side Broom Motor (Item 13): This motor is hydraulically driven by flow leaving the “BYD” port of the hopper
control valve (See Figure 10). It operates whenever the cylinder control valve s in the center position and
the side broom lift lever is in the “DOWN” position.
Side Broom Motor Shutoff Valve (Item 14): This two-way poppet-style cartridge is camactivated when the
side broom assembly is raised (See Figure 10). When it is activated, the side broom motor oil supply is
bypassed. The slight pressure drop across the valve may cause the side broom to rotate at a slow rate
while in the up position.
COMPONENT DESCRIPTION & FUNCTION
T-0078
T0078 Figure 9
T-0079
T0079 Figure 10

American-LincolnTechnology 1-13
3366XPTroubleshooting Guide
COMPONENT DESCRIPTION & FUNCTION
Left Side Broom Motor (Optional) (Item 15): The left side broom option includes a second side broom
motor and shutoff valve plumbed in series with the standard or right side broom motor and shutoff valve.
Each broom motor is independently controlled by the right and left side broom lift levers respectively.
Dump Cylinders (Low Dump) (Item 16): These double acting cylinders are activated by the hopper control
valve (See Figure 11). When the dump lever is in the center position, oil is trapped in the cylinders and
they remain stationary.
When the dump lever is in the “DUMP” position, pressurized oil supply from valve port “A” enters the base
end of the cylinders to rotate the hopper outward while return oil leaves the rod end of the cylinders and
enters valve port “B” and flows back to the reservoir.
When the dump lever is in the “RETURN” position, pressurized oil supply from the valve port “B” enters
the rod end of the cylinders to rotate the hopper backward while return oil leaves the base end of the
cylinders and enters valve port “A” and flows back to the reservoir.
Rotation and Dump Cylinders (Variable Dump) (Items 17 & 18): These cylinders, activated by the hopper
control valve, work together to dump the hopper (See Figure 12). When the dump lever is in the center
position the base ports of both cylinders and rod port of the dump cylinder is blocked, holding the
cylindersstationary.
When the dump lever is in the “DUMP” position, pressurized oil supply from valve port “A” enters he base
ends of both cylinders while the return oil leaves the rod end of the dump cylinder enters valve port “B” and
flow back to the reservoir. The return oil leaving the rotation cylinder flows directly back to the reservoir.
Since each cylinder has a separate function, they do not extend at the same rate. The rotation cylinder
provides the majority of the power to rotate the hopper during the first 50º of rotation and the dump cylinder
alone provides the power to complete the dump cycle.
T-0092/9508
16
16
HOPPER CONTROL
VALVE
DUMP
CYLINDERS
IN OUT
A
B
BYD
T0092 Figure 11
T-0091/9507
TO RETURN
MANIFOLD
17
18
HOPPER CONTROL
VALVE
IN OUT
BYD
A
B
CD
ROTATION
CYLINDER
DUMP
CYLINDER
T0091 Figure 12

1-14 American-LincolnTechnology
3366XP Troubleshooting Guide
Rotation and Dump Cylinders (Variable Dump) (cont.):
When the dump lever is in the “RETURN” position, pressurized oil supply from valve port “B” enters the
rod end of the dump cylinder while the return oil from both cylinders enters valve port “A” and flows back to
the reservoir. The dump cylinder rotates the hopper back and returns the rotation cylinder to its retracted
position.
Hopper Lock-Out Solenoid Valve (Variable Dump) (Item 19): This two-way poppet style solenoid cartridge
valve is activated by the lift arm switch (See Figure 13). When the lift arm switch is depressed by the lift
arm linkage, the valve is energized and automatically lowers the lift cylinders if in the raised position or
presents the lift cylinders from being in the down position. The valve, when energized, opens and
provides a direct [path from the base end of the lift cylinders to the reservoir.
Lift Cylinders (Variable Dump) Item 20): These double-acting cylinders are activated be the hopper control
valve and hopper lock-out valve (See Figure 13).
The hopper lock-out valve disables the lift cylinders until the hopper is rotated out at least 50º. This
protects the machine and prevents debris from prematurely falling out of the hopper back toward the
operator and the machine. For the same reasons, the valve also automatically lowers the lift cylinders
when the hopper is rotated back within 50º of the stops on the lift arms.
When the lift lever is in the “UP” position and the hopper is rotated out at least 50º, pressurized oil supply
from valve port “D” enters the base end of the cylinder while the return oil from the rod end of the cylinders
flows back to the reservoir.
When the lift lever is in the “DOWN” position, oil from the hopper control valve port “C” flows directly back
to the reservoir while oil from the base end of the lift cylinder flows back to the hopper control valve
through port “D” and back to the reservoir. As the cylinders descend, oil is drawn into the rod end of the
cylinders from the reservoir.
COMPONENT DESCRIPTION & FUNCTION
T-0093/9507
20
20
19
T0093 Figure 13

American-LincolnTechnology 1-15
3366XPTroubleshooting Guide
COMPONENT DESCRIPTION & FUNCTION
Reservoir (Item 21): The hydraulic oil reservoir, located to the right of the engine, has a seven (7) gallon
capacity. The 100 mesh auxiliary pump suction strainer is contained in its front lower corner (See Figure
14).
Return Filter (Item 22): This 10 micron return filter is located above and in front of teh engine. With the
exception of the fan motor case drain, all the return oil is directed through the return filter (See Figure 14).
Hydraulic OIl: The 3366 sweeper hydraulic system contains approximately 8 gallons of FordATF Type “F”,
Mobil UniversalATF or equivalent mineral oil. Special care should be given to maintain a proper level of
hydraulic oil in the reservoir. With the hopper in the down or normal sweeping position, the oil level
should reach the center of the sight gauge.
Steering Control Valve (Item 23): The steering control valve is a manually operated directional control valve
and a servo feedback metering valve in one (See Figure 15). The control valve converts the operator’s
action of rotating the steering wheel into a pressurized flow of oil and directs it to the proper port of the
steering cylinder which is hydraulically connected to the valve.
Steering Cylinder (Item 24): The steering cylinder is a double-acting cylinder which is hydraulically linked to
the steering control valve. It is mounted to the frame and the steering arm of the rear wheel yoke.
SUCTION
STRAINER
FILTER ASSEMBLY
T-0094/9507
3
22
21
T0094 Figure 14
T-0099
23
24
TP
R
L
T0099 Figure 15

T-0097/9602
8
American-Lincoln Technology
3366XP Troubleshooting Guide
1-16
3366 VARIABLE DUMP HYDRAULIC SCHEMATIC

T-0098/9602
8
T0098
3366 LOW DUMP HYDRAULIC SCHEMATIC
American-Lincoln Technology
3366XP Troubleshooting Guide
1-17

ELECTRICAL SCHEMATIC FORD 413 ENGINE
American-Lincoln Technology
3366XP Troubleshooting Guide
1-18
NOTE:
ALARMSTAT AND
PRESSURESTAT
ARE SHOWN
WITH ENGINE OFF
ALARMSTAT
(NO) CLOSES 214ºF
(NC) OPENS 220ºF
PRESSURESTAT
(NC) CLOSES 9 PSI
(NO) OPENS 5 PSI
R
(WATER)
ALARMSTAT
(NC)
(C)
(NO)
(NC)
WARNING
LIGHT
(OIL)
PRESSURE
(NO)
(C)
AUTOMATIC
OVERRIDE
1
2
3
C0580
K-SW
ACC
IGN
ST
BATT
CB-5
CB-4
CB-3
CB-2
CB-1
CB-7
CB-6
M1
H-PB
12 VOLT BATTERY
51A
ALTERNATOR (PRESTOLUTE)
+
D1
M2
30 87
HORN
MTR
SHAKER MOTOR
SHAKER MOTOR
MTR
MTR
16
TD-1
3
2
BROOM & FAN RELAY
M4
85
86
SHAKER MOTOR RELAY
M2
86 85
SHAKER RELAY
M1
HM
(-)
(+)
NOTE: OP-SW IS SHOWN WITH ENGINE OFF
(NO) OPENS 4 PSI
(OP-SW)
(NO)
(C)
(NC)
VRS
TO BE USED WITH OPTIONAL SHUT DOWN CARB SOLENOID (GAS ONLY)
(4)
(1)
SPARK PLUGS
DISTRIBUTORLESS
IGNTION
COIL
-
(3)
+
(2)
VRS -
VRS + 2
3BLANK
1
5
BLANK
VBATT
8
CDO (PHASE A)
CDO (PHASE B)
11
12
U E S C6
7
ECT 10K
1WATT OCT 2
OCT 1
GROUND
9
4
10
ECT 2
R2 ECT1
(NO)
SM-SW
HO-SW (C)
B&F-SW
M4
30 87A
BROOM & FAN SOLENOID
LIFT ARM CYLINDER LOCK OUT SOL.
HELD CLOSE BY HOPPER
(C) (NC)
LALO-SW
VARI-DUMP ONLY
(OPS)
(FGS)
(WTS)
(GAS ONLY)
(I) (G)
VM
OP
WT
FG
(I) (S)
(G)
(I)
(I)
(G)
(S)
(G)
(S)
L-SW
1
2
FU-1
WL-SW WORK LIGHT
LT HEAD LIGHT
RT HEAD LIGHT
SIDE BROOM LIGHT
LT TAIL LIGHT
LT BRAKE LIGHT
RT TAIL LIGHT
RT BRAKE LIGHT
FRONT REAR
REAR
FRONT
BR-SW
FU-2
BAN
FLASHER
YEL BLU
GRN
RED
INDICATOR
TURN
SIGNALS
BU-SW
REVERSE
WSB-SW
DEFROSTER
OFF
MTR
C
MTR
HEATER
HIGH
LOW
H-SW RES
RES
WIPER
DOME LIGHT
MTR
PULL PUSH PRESSURIZER
HIGH CLEARANCE CAB
BACK-UP ALARM
(-)
(+)
BEACON LIGHT
(STROBE, FLASHING, 360º ROTATING)
WET SWEEP BYPASS SOL.
FAN
MTR
7

12 VOLT BATTERY
+-
M10
M1
(B+)
(F)
B+
AF
S
I
MTR
M10
MTR
MTR
STARTER MOTOR
STARTER SOLENOID
60A ALTERNATOR
VOLTAGE REGULATOR
GRN/ RED
CB-1
CB-2
M2
87
30
SHAKER MOTORS
BROOM and FAN RELAY
RED/ BLUE WHITE
M4
M2
8586
86 85
SHAKER MOTOR RELAY
TD-1
1
2
3
6
7
H-PB HORN
STARTER RELAY
M1
CB-3
CB-4
CB-5
BATT
ST
IGN
ACC
K-SW
(NO) (C) NOTE: OP-SW IS SHOWN
WITH ENGINE OFF (NO) OPENS 4 PSI (+)
+
+
(S)
HM(-)
-
-
TO BE USED WITH OPTIONAL SHUT DOWN
OUT GND
PM
CB-6
CB-7
1
2
34
AUTOMATIC OVERRIDE
(OIL)
PRESSURESTAT
(NO)
(C)
(C)
WARNING LIGHT
(NC)
(NC)
(NO)
(WATER)
ALARMSTAT
R
NOTE
ALARMSTAT AND PRESSURESTAT ARE SHOWN WITH ENGINE OFF
ALARMSTAT (NO) CLOSES 214° F
(NC) OPENS 220° F
PRESSURESTAT (NC) CLOSES 9 PSI
(NO) OPENS 5 PSI
BROOM AND FAN SOLENOID
30 87A
B & F-SW
HO-SW (C) (NO)
SM-SW HELD CLOSED
BY HOPPER
HELD CLOSED BY HOPPER
RESISTANCE
(C) (NO)
LIFT ARM CYLINDER LOCK OUT SOLENOID
LALO-SW
(VARI DUMP ONLY)
(I) (G)
(I) (S)
(G)
(I) (S)
(G)
(I) (S)
(G)
VM
OP
WT
FG
(OPS)
(WTS)
(FGS)
WORK LIGHT
CLOGGED FILTER WARNING SYSTEM
ELECTRONIC
LT HEAD LIGHT
RT HEAD LIGHT
SIDE BROOM LIGHT
LT TAIL LIGHT LT BRAKE LIGHT
RT TAIL LIGHT RT BRAKE LIGHT
LT
RT
REAR
FRONT
FRONT
REAR
BACKUP ALARM
(-)
(+)
L-SW
1
FU-1
2
BR-SW
BRN
BRN
FLASHER
INDICATOR
YEL
BLU
GRN
RED
BU-SW
TURN
SIGNALS
REVERSE
WL-SW
BEACON LIGHT
(STROBE, FLASHING, 360° ROTATING)
WET SWEEP BYPASS SOLENOID
WSB-SW
)GAS ONLY)
DEFROSTER
OFF MTR
RES
OFF
HIGH
I-SW RES
LOWHEATER MTR
C
DOME LIGHT
WIPER
MTR
PULL
P-SW PRESSURIZER
HIGH CLEARANCE CAB
FAN
MTR
PR-SW
(C)
(NO)
5"-6" IW
R
1
2
3
6
TD-2
20 SEC. OP-SW BY-PASS
P-4700A/9605
1
2
3
YEL.
CONTROL
RED/ GRN
RED/ BLU
&
COIL
HIGH TENSION
(GAS
CARB
ONLY)
SOL.
SPARK PLUGS
MODULE
13
4
566
77
88
DISTRIBUTOR
&
WIRE1.05 1.15-
ELECTRICAL SCHEMATIC FORD 425 ENGINE
American-Lincoln Technology
3366XP Troubleshooting Guide
1-19