2.
Relieve sweeper hydraulic system pressure.
1
NOTE: The ports on the control manifold are marked to
identify hydraulic connections. Example: R1 is the sys-
tem relief valve port (See Hydraulic Schematic in Chap-
ter 6 – Foldout Diagrams to identify the function of the
hydraulic lines and cartridge valves at each manifold
port location).
2
3.
Label all control manifold electrical and hydraulic
connections for assembly purposes.
4.
Disconnect wire harness electrical connector from
solenoid valve on control manifold.
Figure 42
2.
5.
Clean control manifold and manifold hydraulic con-
1.
Hydraulic manifold
Drawbar
nections. Disconnect hydraulic hoses from manifold fit-
tings.
4. Visually inspect the manifold port for damage to the
sealing surfaces, damaged threads and contamination.
6.
Allow disconnected hydraulic lines to drain into a
suitable container. Put caps or plugs on disconnected
hoses and fittings to prevent contamination. Discard any
removed O–rings.
5. Visually inspect cartridge valve for damaged sealing
surfaces and contamination.
A. Contamination may cause valves to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing malfunction.
7.
Support control manifold to prevent it from falling.
Remove four (4) cap screws and flat washers that se-
cure hydraulic manifold to the machine frame.
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
8.
9.
Remove hydraulic manifold from the machine.
Remove hydraulic fittings from manifold as needed.
Discard any removed O–rings.
CAUTION
Hydraulic Manifold Service (Figs. 40 and 41)
1.
moving any cartridge valve.
Make sure the control manifold is clean before re-
Use eye protection such as goggles when using
compressed air for cartridge valve cleaning.
2.
If solenoid cartridge is being serviced, remove nut
securing solenoid to the cartridge valve. Carefully slide
solenoid off the valve.
CAUTION
CAUTION
Abrupt movement of internal spools can cause
stored fluid to be released suddenly.
Operate all sweeper hydraulic controls to relieve
system pressure and to avoid injury from pres-
surized hydraulic oil. See Relieving Hydraulic
System Pressure in the General Information sec-
tion of this chapter.
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 out 20 to 30 times to flush out contamination. Be ex-
tremely careful not to damage cartridge. Use com-
pressed air for cleaning.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
7.
Reinstall the cartridge valve into control manifold:
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.
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 arranged properly on
the cartridge valve for proper operation and sealing.
Hydraulic System
Page 3 – 46
Topdresser 1800 & 2500
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