Toro Workman 3000 Series, Service Manual

Page: 241 / 306

4. Visually inspect the port in the manifold for damage
to the sealing surfaces, damaged threads, and contami-
nation.
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.
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.
6. Clean cartridge valve using clean mineral spirits.
Submerge valve in clean mineral spirits to flush out con-
tamination. Particles as fine as talcum powder can affect
the operation of high pressure hydraulic valves. If car-
tridge 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 extremely careful not to damage car-
tridge. Use compressed air for cleaning.
7. Reinstall the cartridge 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 seal-
ing.
IMPORTANT: Use care when handling the valve car-
tridge. Slight bending or distortion of the stem tube
can cause binding and malfunction.
B. Thread cartridge valve carefully into manifold
port. The valve should go in easily without binding.
C. Using a deep socket, torque cartridge valve from
30 to 35 ft–lb (41 to 47 N–m).
D. For solenoid valve, carefully install solenoid coil
to the cartridge valve making sure that seal is
installed on both top and bottom of coil. Torque nut
from 50 to 55 in–lb (5.6 to 6.2 N–m). Over–tightening
may damage the solenoid or cause the valve to mal-
function.
8. If problems still exist, remove valve and clean again
or replace valve.
Hydraulic
System
Workman 3000/4000 Series Page 9 – 47 Hydraulic System