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Pro Sweep Hydraulic SystemPage 3 -- 31
NOTE: The ports on the manifold are marked for easy
identification of components. Examples: P is the pump
connection port and OR2 is the location for an orifice
(See Hydraulic Schematic to identify the function of the
hydraulic lines and cartridge valves at each port).
Hydraulic Manifold Service (Fig. 19)
1. Make sure the control manifold is clean before re-
moving any cartridge valve.
2. If solenoid cartridge is being serviced, remove nut
securing solenoid to the cartridge valve. Carefully slide
solenoid off the valve.
CAUTION
Before disconnecting any hydraulic compo -
nents, operate all sweeper hydraulic controls to
relieve system pressure and avoid injury from
pressurized hydraulic oil. See Relieving Hydrau-
lic System Pressure in the General Information
section of this chapter.
WARNING
If control manifold is attached to sweeper, make
sure that sweeper is fully lowered before loosen-
ing hydraulic lines, cartridge valves or plugs
from controlmanifold. Ifsweeper is not fully low-
ered as manifold components are loosened,
sweeper may drop unexpectedly.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
3. Remove cartridge valve with a deep socket wrench.
Note correct location for O--rings, sealing rings and
backup rings. Remove and discard seal kit from valve.
4. Visually inspect the manifold port for damage to the
sealing surfaces, damaged threads or contamination.
5. Visually inspect cartridge valve for damaged sealing
surfaces and contamination.
A. Contamination may cause valves to stick or hang
up.Contaminationcanbecomelodgedinsmallvalve
orifices or seal areas causing malfunction.
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
CAUTION
Use eye protection such as goggles when using
compressed air for cartridge valve cleaning.
CAUTION
Abrupt movement of internal spools can cause
stored fluid to be released suddenly.
6. Clean cartridge valve by submerging valve in clean
mineral spirits to flush out contamination. Particles as
fine as talcum powder can affect the operation of high
pressure hydraulic valves. If cartridge design allows,
use a wood or plastic probe to push the internal spool in
and out20 to 30 times to flush out contamination. Be ex-
tremely careful to not damage cartridge. Use com-
pressed air for cleaning.
7. Install the cartridge valve into control manifold:
A. Lubricate new seal kit components with clean hy-
draulic oil and install on valve. The O--rings, sealing
rings and backup rings must be arrangedproperlyon
the cartridge valve for proper operation and sealing.
IMPORTANT: Use care when handling the valve
cartridge. Slight bending or distortion of the
stem tube can cause binding and malfunction.
B. Threadcartridge valve carefullyinto correct man-
ifold port. The valve should go in easily without bind-
ing.
C. Torque cartridgevalveusingadeepsocket to val-
ues identified in Figure 19.
8. If solenoid cartridge was removed, carefully install
solenoid coil onto the cartridge valve. Install nut and
torque nut to 60 in--lb (6.8 N--m) (do not over tighten).
9. After assembly, if problems still exist, remove valve
and clean again or replace valve.
Hydraulic
System