Clean
WARNING
Cleaning solvents can be flammable and toxic and
can cause skin irritation. When using cleaning
solvents, always follow the solvent manufactur-
er's recommended safety procedures.
WARNING
Compressed air can move particles so they cause
injury to the user or to other personnel. Make sure
the path of the compressed air is away from all
personnel. Wear protective goggles or a face
shield to prevent injury to the eyes.
1.
If all components of the outlet control valve sec-
tion have been removed, clean the outlet control
valve section using cleaning solvent and dry us-
ing compressed air.
2.
If all components have not been removed, clean
the outlet control valve section using a lint-free
cloth.
Inspect
Inspect the outlet control valve section mating sur-
faces and the bore of the secondary relief valve, if
removed, for damage. If either the mating surface
or the secondary relief valve bore are damaged, re-
place the outlet control valve section.
If disassembled, inspect the components of the sec-
ondary relief valve. If any components other than
O-rings, backup rings, and the spring are damaged,
replace the secondary relief valve.
NOTE:
If the outlet control valve section is not to
be reassembled immediately, coat surfaces with
clean hydraulic oil to prevent the possibility of rust.
Cover the outlet control valve section with a clean,
dry, lint-free cloth to prevent the possibility of con-
taminants entering the outlet control valve section.
Assemble
NOTE:
Coat all backup rings and O-rings with a
light coat of clean hydraulic oil to make installation
easier.
NOTE:
Perform Step 1 through Step 7 only if the
secondary relief valve was repaired.
1.
Install a new backup ring on the secondary re-
lief valve plug. See Figure 6.
2.
Install the poppet, washer, and spring into the
secondary relief valve plug.
3.
Install a new O-ring on the adjusting nut, and
install the adjusting nut and jam nut assembly
into the secondary relief valve plug using the
number of turns noted during disassembly.
4.
While holding the adjusting nut in place,
tighten the jam nut to 24 ±3 N•m (18 ±2 lbf ft).
5.
Install a backup ring, O-ring, and backup ring
into the adjusting nut.
6.
Install a new O-ring onto the plug. Install the
plug into the adjusting nut.
7.
If removed, install secondary relief valve into
outlet control valve section. Tighten relief valve
plug to 45 ±4 N•m (33 ±3 lbf ft). See the section
Pressure Relief Valve Check and Adjustment to
adjust the secondary relief valve and check the
pressure.
Install
NOTE:
Coat all O-rings with light coat of clean hy-
draulic oil to make installation easier.
1.
Install new O-rings (13, Figure 7 ) into the aux-
iliary valve section. Install the outlet control
valve section on the four tie rods.
2.
Install the four nuts on the tie rods. Tighten
the three 13 mm (½ in.) nuts to 24 ±2 N•m (212
±18 lbf in) and the 15 mm (9/16 in.) nut to 45
±4 N•m (33 ±3 lbf ft). See Figure 6.
Auxiliary Control Valve Section
NOTE:
There is the possibility of having two auxil-
iary control valve sections depending upon how
many functions are on the lift truck. If the main
control valve is a four-function control valve, there
will be two auxiliary control valve sections. These
sections are repaired the same way.
Remove
1.
Remove the outlet control valve section. See
Outlet Control Valve Section, Remove.
2000 SRM 1899
Main Control Valve Repair
7
