Assembling Control Valve - Doosan DX140R Shop Manual

Assembling Control Valve

Assembling Add-on Section
1. Install tie rod in the main body valve housing.
Tighten the tie rod to effectively thread the end. If the
thread cannot perform its proper function, an oil leak
may occur at the contact surfaces due to the
insufficient jointing force of the add-on section,
causing malfunction.
Furthermore, the threads may be broken by overload,
resulting in malfunction.
2. Install the O-ring on the contact surface of the main body.
3. Using the tie rod as a guide, mount the inlet housing on the
main body valve housing. Install the O-ring on the contact
surface.
4. Using the tie rod as a guide, mount the valve housing for
the spool section on the inlet housing. Install the O-ring on
the contact surface.
5. Using the tie rod as a guide, mount the outlet housing on
the valve hosing for spool section.
When inserting the add-on section, take care not to
dent or scratch the contact surfaces. Otherwise, oil
may leak at
malfunction. Also, take care that foreign material on
the contact surface do not cause the O-ring to drop out
or change position.
When installing the add-on section, the tie rod must be
used as a guide for correct positioning. Otherwise, the
O-ring on the contact surface may be separated,
causing oil leak and malfunction.
6. Insert the hex nut into the tie rod and tighten them.
Torque: 152±7N•m
Insert the hex nut into the tie rod and tighten them.
Torque: 93±4N•m
Main Control Valve
CAUTION
CAUTION
the contacting surface
CAUTION
causing
SP001029
Page 31