[HYDRAULIC SYSTEMS]

Each of the following Schwarze M5000 Sweeper devices is powered by a separate branch of the hydraulic system:

- The main broom
- The right and left gutter brooms
- The elevator
- The hopper dump
- The water pump

This split system, including a multi-stage pump to push fluid through hoses and control valves, maintains the necessary hydraulic pressure for running all sweeper devices. Activated by console switches, electrically-controlled valves determine hydraulic fluid flow to these
devices.

The hydraulic system includes the following components:

- 37-gallon hydraulic tank " Motors for elevator, gutter brooms and main broom
- Multi-stage pump " Suction strainers
- Return filters " Hydraulic hoses connecting tank, pump, filters and motors
- Control valves " Hydraulic cylinders
- Oil cooler

From the cab the operator starts the auxiliary engine. A direct-drive gear on the auxiliary engine starts the pump that drives the hydraulic system.

From the 37-gallon hydraulic reservoir, fluid passes through strainers (located in the hydraulic tank’s 2 suction ports), the multi-stage pump, 2 hydraulic manifolds (inside the auxiliary engine compartment), the oil cooler, a spin-on return filter and back into the hydraulic reservoir.

Each hydraulic manifold contains a bank of valves controlling system devices. Valves on one manifold enable gutter brooms and the water-pump motor. Valves on the other manifold enable the elevator, main broom and hopper dump system.

The operator controls (hydraulically-powered) sweeper devices with switches on a central control panel on the cab console. To illustrate, the following paragraphs track operator actions and main broom hydraulic system performance during a sweeping task.

When the operator toggles the main broom switch to RUN, the electrical solenoid within that directional valve is activated and fluid flowing through the manifold is diverted to the main broom hydraulic system, driving first the lift cylinders and then the main broom motor. The main broom lowers and sweeps. Hydraulic fluid reaches both the lift cylinders and the main broom motor as long as the main broom is sweeping.

When the main broom sweeping task is finished, the operator toggles the main broom switch to OFF. The electrical solenoid within that directional valve is shut down and hydraulic fluid no longer reaches the broom motor.

The operator then toggles the main broom switch to UP. A solenoid on the opposite side of the directional valve is activated and hydraulic-fluid flow to the lift cylinders is reversed, causing the cylinders to lift the broom from the sweeping surface.

Operator releases switch, which automatically returns to the center OFF position, stopping fluid flow to the main broom hydraulic branch.

The operator shuts down the auxiliary engine, stopping the pump that drives the hydraulic system.


[WATER (HYDRAULIC-DRIVEN)]

The water system's hydraulic branch operates the hydraulic motor used to drive the water pump. Before any dust suppression function may be used, the sweeper's operator must toggle the console's water pump switch to the ‘on’ position. This switch activates the center valve on the right-hand-side hydraulic manifold. The valve is used to divert hydraulic fluid from the manifold and into a hose connected to the water pump's hydraulic-drive motor. The passage of fluid through the motor causes it to turn. Upon exiting the motor, the hydraulic fluid returns to the right-hand-side hydraulic manifold.

When the level in the water reservoir becomes low, a sensor, located in the water reservoir's wall, interrupts power to the manifold valve. This stops hydraulic fluid flow, halting the water pump's hydraulicdrive motor. It also prevents the water pump from operating when the water reservoir is empty.


[HOPPER DUMP]

When the hopper is to be dumped, the operator toggles the console's dump switch to the ‘up’ position. This activates a directional valve on the left-hand-side hydraulic manifold. The directional valve diverts fluid flow to the outrigger cylinders for extension. After approximately 3000 lbs. of load weight is applied to the outrigger pads, the outrigger cylinders are locked out solid against the ground. The cylinders which dump the hopper, as well as close the hopper's elevator-opening door, are controlled from a manifold consisting of preset sequence valves, preset counterbalance valves and a preset pressure reducing valve. Once the hopper has been dumped, the operator toggles the console's dump switch to the ‘down’ position. This activates the opposite side of the directional valve and hydraulic fluid is diverted through the circuit in the opposite direction. The hopper lowers and returns to a seated position. The hopper’s elevator door opening re-open. The outrigger cylinders retract to their travel position. The console switch is toggled to the ‘off’ position and hydraulic fluid flow, diverted to the dump circuit by the directional valve, stops.


[GUTTER BROOMS]

The gutter broom's branch of the hydraulic system is used to rotate the broom disc and to retract the broom to its travel position.

The gutter broom hydraulic system consists of:
- Right and left gutter broom motors
- Right and left gutter broom lift cylinders

When the gutter broom is needed, the operator toggles the console's gutter broom switch to the ‘run’ position. This activates a directional valve on the right-hand-side hydraulic manifold. The directional valve diverts fluid flow to a motor attached to the gutter broom's disc. The movement of fluid through the motor causes it to rotate. Fluid exits the motor, passes through a valve block, and returns to the right-handside hydraulic manifold. The console's gutter broom switch also activates two solenoids located in the valve block. The first solenoid controls a 2-position/2-way valve; the second a 2-position/3-way valve. When the console switch is operated for gutter broom extension, the solenoids reconfigure fluid flow within this valve block. This allows hydraulic fluid in the rod-end of the hydraulic retraction cylinder to free-flow back to the hydraulic tank via a bleed-off line. With no hydraulic pressure against its rod-end, the cylinder is free to be extended by the gutter broom's outer spring.

When the gutter broom is to be retracted, the operator toggles the console switch to the ‘up’ position. This activates the opposite side of the directional valve and hydraulic fluid is diverted through the circuit in the opposite direction. However, fluid is prevented from reaching the gutter broom motor by a checkvalve in the valve block. Because the console switch is toggled to retract, the solenoids in the valve block are no longer activated and the block returns to its original fluid flow configuration. Fluid now is directed through the valve block and to the rod-end of the hydraulic cylinder. With pressure against its rod-end, the cylinder is forced to retract. After the gutter broom is retracted to its travel position, the console switch is toggled to the off position and fluid flow, diverted to the gutter broom circuit by the directional valve, stops.


[MAIN BROOM]

The main broom's branch of the hydraulic system is used to retract and extend the lift cylinders, as well as to rotate the main broom.

The main broom hydraulic system consists of:
- Main broom motor
- Right and left main broom lift cylinders

When the main broom is needed, the operator toggles the console's main broom switch to the ‘run’ position. This activates a directional valve on the left-hand-side hydraulic manifold. The directional valve diverts fluid flow to a smaller manifold block mounted to the frame. From this smaller manifold, hydraulic fluid passes through hoses to the rod-end of the two lift cylinders causing them to retract and lower the main broom. This small manifold block is also attached by hoses to the main broom's motor. Fluid passes down a hose to the main broom motor. The movement of fluid through the motor causes it to rotate. Upon exiting the motor, it returns to the small manifold block. Hydraulic fluid then flows from the small manifold back to the larger left-hand-side hydraulic manifold.

When the main broom is to be raised, the operator toggles the console's main broom switch to the ‘up’ position. This activates the opposite side of the directional valve and hydraulic fluid is diverted through the circuit in the opposite direction. From the smaller manifold block, hydraulic fluid passes through hoses to the butt-end of the two lift cylinders, causing them to extend and raise the main broom. To prevent reverse rotation of the main broom, a check valve, located in the small manifold block, halts fluid flow to the main broom's motor.

NOTE: The main broom and elevator are controlled by separate cab-console switches, and enabled by separate directional valves on the manifolds. However, these two devices are physically connected so that the lift mechanism raising the main broom also raises the elevator.


[ELEVATOR]

The elevator's branch of the hydraulic system is used to run the hydraulic motor which drives the conveyor.

The elevator hydraulic system consists of:
- Elevator motor

When the elevator is needed, the operator toggles the console's elevator switch to the ‘run’ position. This activates a directional valve on the left-hand-side hydraulic manifold. The directional valve diverts fluid flow through hoses to the elevator motor. The movement of fluid through the motor causes it to rotate. Upon exiting the motor, it returns to the large left-hand-side hydraulic manifold.

NOTE: The main broom and elevator are controlled by separate cab-console switches and enabled by separate directional valves on the manifolds. However, these two devices are physically connected so that the lift mechanism raising the main broom also raises the elevator.


[CONSOLE INSTRUMENTS AND CONTROLS]

Standard Instruments and Controls

The control panel is located inside the cab and mounted within easy reach of the driver/operator. All controls on the console are electrically operated.

Also present is an hour meter for recording auxiliary engine running time. This gauge is important and should be checked periodically so that maintenance is properly scheduled. (See Section 3 Maintenance, for maintenance schedules.)

Other standard gauges include:
- Tachometer
- Volt meter
- Oil pressure
- Temperature

Your sweeper is equipped with a shutdown system that shuts down the auxiliary engine if the oil pressure or radiator coolant temperature falls outside acceptable limits. It will also shut-down if the coolant level is low.

Optional Instruments and Controls A low-water (optional) indicator light mounted in the console alerts the operator that the dust suppression reservoir needs refilling. An optional air-restriction gauge is located along the top edge of the console. This gauge indicates when it is time to change the auxiliary engine’s air filter. An optional gauge is available for the chassis engine.


[LIGHTS AND FLASHERS]

To increase operational safety, the sweeper may be equipped with a number of electric lights and flashers.

Included on every sweeper are arrow boards and spotlights for the gutter brooms and main broom, enabling the operator to see when operating at night.

Optional lights and flashers include:
- Flashing warning barlight beacon or strobe on top of the cab or the sweeper to alert motorists and pedestrians of the presence of a slow moving sweeping machine
- Additional warning strobe lights or beacons
- Flashing warning lights

All lights are controlled by toggle switches mounted on the console inside the truck cab. The operator is cautioned to properly maintain all lights and flashers, replacing bulbs and fuses when needed.


[DUST SUPPRESSION SYSTEM]

The dust suppression system consists of:
- Reservoir of 2 polyethylene tanks with a combined water capacity of 360 gallons
- Cross tubes connecting the tanks
- The Y strainer
- Hoses
- Front spray bar
- Gutter broom spray nozzles
- Hydraulic-driven roller pump
- An optional rear main broom spray bar
- An optional washdown nozzle
- Water manifold
- Solenoid valves

Using strategically placed spray nozzles to dampen the sweeping surface in front of the gutter and main brooms, the dust suppression system is designed to reduce the amount of airborne dust produced during sweeper operations. Water is stored in a durable, rust-free, polyethylene reservoir. Dual tanks are located on either side of the sweeper and connected by cross tubes to ensure even weight distribution at any water level. The double-tank water reservoir, easily and quickly filled from fire hydrants using a standard 2-1/2-inch hydrant hose, has a 360-gallon capacity that reduces time spent on fill-ups.

From the 360-gallon reservoir, water flows through a Y strainer, the hydraulically-driven water pump, the water manifold and hoses to spray nozzles.

From the sweeper console, switches control water flow with solenoid valves attached to the manifold. Water may be directed to nozzles in the front spray bar and/or the gutter broom spray nozzles and/or the optional rear main broom spray bar, depending upon where dust suppression is needed.

Water consumption is determined by:
- The number of nozzles opened
- The length of time nozzles are open

In normal conditions, not all water solenoid valves are open.

A sensor, in the water reservoir’s wall, operates a light on the console to alert the operator that the reservoir’s water level is low. The sensor also automatically halts the hydraulic motor driving the water pump, so that dry pumping does not occur.

For winterizing, a valve pushing high-velocity air into the dust suppression system helps to purge the hoses of water.

Dust suppression system

After the auxiliary engine is started, a cab-console switch is used to open a directional valve, sending hydraulic fluid to the water pump hydraulic drive motor.

Water flows from the 360 gallon polyethylene reservoir (dual tanks connected by a cross tube) through the Y strainer located between the water reservoir and the pump. This Y strainer removes debris particles.

After pulling in the water, the water pump pushes it out under pressure.

Water is then directed to a water manifold. A solenoid on the side of the water manifold is electrically opened (by a cab console switch) and water is allowed to flow to the water function.

At the water function (i.e., spray bar, gutter broom water) water passes through nozzle strainers and out the spray nozzles onto the pavement surface.

When dust suppression is no longer needed, the operator turns off switches for water-manifold solenoids and the water pump hydraulic drive motor. Water stops flowing. Hydraulic fluid ceases to reach the motor, and the water pump stops.

A washdown hose may be attached to a quick disconnect located on the end of the manifold. This is especially useful for end of shift cleanup.

For dust suppression system maintenance, part replacement and winterizing, see Section 3.10 Dust Suppression System Maintenance.


[DUAL STEERING SYSTEM]

Dual steering allows the sweeper operator to drive from either the right or left side of the truck. Major components located on both sides include:
- Steering wheel
- Self-canceling turn signals
- Accelerator
- Brake pedal

Driving from the right side gives the operator better control of the sweeper while sweeping on the right side of the truck. For travel to and from sweeping sites, operators drive from the left side of the truck cab.

The Schwarze M5000 offers the following 2 kinds of dual-steering systems:

- Hydraulic

With this system, you must identify the switch (usually mounted on the truck console) that is used to select the steering position. In a hydraulic dual steering system, only one steering column at a time is powered and used to steer the truck. The switch is flipped to select which steering column is empowered.

- Mechanical

This system uses a metal crossover bar instead of hydraulic lines. Either steering position can be used at any time. There is still a switch that must be activiated to enable certain controls on other steering column.


[GUTTER BROOM]

The gutter broom’s main function is to scrub the surface at the sides of the sweeper (usually the gutters). This lifts debris and directs it into the path of the main broom to be swept into the elevator and transported to the hopper. The two rotating 44-inch gutter brooms complement the Schwarze M5000 main broom.

Mounted under the chassis, behind the cab on both the right and left sides of the sweeper, gutter brooms are suspended from the frame. Each hydraulically controlled arm, operated from the cab console, contains a hydraulic motor for turning the broom head which is mounted inside a disc. Because gutter broom extension and down-pressure relief are controlled by springs, the gutter broom automatically relieves when run against an obstacle during operation. A hydraulic cylinder retracts the gutter broom to its travel position, above pavement the surface and underneath the truck. This unique design allows the Schwarze M5000 (1) minimum width and maximum surface clearance during travel position and (2) maximum width and surface contact during a sweeping operation.

Although the gutter brooms’ usual function is scrubbing beyond the outside edges of the main broom’s path, the optional GUTTER BROOM EXTENSION OVERRIDE (GEO) allows the gutter broom to drop straight down and scrub. During this operation, a cab-console-control-panel switch retracts an actuator that prevents the broom from extending to the curbline.


[MAIN BROOM]

The main broom's function is the sweeping of debris forward into the elevator's auger. The main broom is operated by a switch on the console.

The main broom is located in the main broom housing. The main broom housing is attached by a trailer hitch to the truck frame and towed at the rear of the truck. The tow frame of the main broom housing is attached to a lift assembly by chains. The lift assembly, bolted to the back of the truck, is rotated by hydraulic cylinders and serves to raise and lower both the main broom and the elevator.

The broom is mounted on an arbor inside the main broom housing. The ends of the arbor's shaft protrude through bearings on either side of the housing. A hydraulic motor, attached to one end of the arbor, turns the broom. To compensate for broom bristle wear, the broom arbor may be lowered by the bearing adjusters located on either side of the broom housing. The broom housing's top is hinged at the rear of the tow frame to afford quick and easy access to the main broom.

The broom housing rides on casters bolted to either side of the tow frame. Since the casters cannot swivel 360 degrees, the truck should never be backed up with the main broom down. However, if the auxiliary engine is running and the main broom switch is in the “RUN” position when the truck is put in reverse. The main broom is designed to automatically raise. Spring cartridges, bolted to the truck and attached to the tow frame by chains, are used to relieve some of the broom housing's weight. This also lengthens caster life.

A dirt deflector at the rear of the broom housing captures debris carried over the top of the rotating broom and directs it back beneath the sweeping bristles.


[ELEVATOR]

The function of the elevator is to receive debris from the main broom operation and transport it into the hopper. The elevator run operation is controlled by a switch on the console. This elevator has been designed as a non-fixed-position elevator, having a lowered 'run' position and a raised 'travel' position. The elevator is attached to a lift assembly by chains. The lift assembly, bolted to the back of the truck, is rotated by hydraulic cylinders and serves to raise and lower both the main broom and the elevator. Since the lift assembly is controlled by the main broom console switch, the raising and lowering of the elevator is dependent upon the raising and lowering of the main broom.

As the main broom sweeps, it pitches debris into the elevator area known as the cup. A rotating auger, located in the cup, is used to center debris below the main elevator shaft. Within the elevator shaft, which runs at an angle up from the cup to the top of the sweeper, are two heavy chains. These two strands of chain loop around sprockets mounted to an upper axle, located at the top of the elevator shaft, and a lower axle (the auger), located in the elevator cup. A hydraulic motor, attached to one end of the upper axle, drives this conveyor assembly. Fourteen flight angles are attached to the two chains. Fastened to each of these flight angles is a rubber flap. As the flights travel about the conveyor loop, the rubber flaps scoop debris from the elevator's cup and drag it up the abrasion-resistant elevator floor. As the flight angle rounds the top axle, the rubber flap pitches the debris into the hopper with a flicking action.


[HOPPER]

The function of the 5 cubic yard capacity hopper is to receive material from the dirt-conveying elevator. When desired, the hopper contents may be dumped onto the pavement surface or into a dump truck on the dump side of the sweeper.

NOTE: Customers specify which side will be used for dumping when the unit is ordered. Accordingly, the hopper dumps from the left or right side of the sweeper.

The hopper dump is controlled by a switch on the console.

The hopper is equipped with a plexiglass window in its front wall. This portal allows the operator to know at a glance when the hopper is nearing its capacity. Plexiglass windows in each of the two dump doors light the hopper's interior.

Debris is received from the elevator through an opening in the upper rear wall of the hopper. During the dump operation, this opening is automatically sealed by a door. The door is opened and closed by an hydraulic cylinder integrated into the hopper's hydraulic dump sequence.