SUBSECTION 5C
CONTROL VALVES
GENERAL
1. Using a suitable tool, press in on gland (15) and remove
retaining ring (11) from body (01).
This subsection contains the information necessary to re-
pair the directional control valves which direct-hydraulic
2. Remove stem (14), gland (15), spring (09) and spool (08).
fluid to the various actuating cylinders.
3. Remove O-ring (10), seal (12) and wiper (13) from gland
GENERAL REMOVAL
(15) and replace with new parts from seal kit.
Prior to removing any of the components in this section,
4. Turn plug (04) out of body (01), remove O-ring (03) and
shut down the engine and disconnect the battery ground
replace with a new O-ring.
cable to prevent machine operation while the item is being
5. Clean and inspect the other parts for damage. Any de-
serviced. Operate the controls to relieve all pressure in the
fect to, parts, other than the ones found in the seal kit, will
system and also clean the area around the item being re-
require the replacement of the valve.
moved to prevent the entry of contaminants.
6. Lubricate the parts with clean hydraulic oil.
7. Install spool (08) into the body with the grooved end
CONTROL VALVE (36Q384)
facing orifice plug (04).
DESCRIPTION. This valve is used to control the rotation of
8. Place spring guide (07) spring (06), and new washer (05)
the drums. A three stack valve is used to control the front,
into the body of the valve. Then install and tighten orifice
rear and boom hoist drums. The valves are sandwiched
plug (04).
between an inlet and outlet section. Movement of a control
handle directs any control pressure to the appropriate
9. Assemble spring guide (02), spring (09), gland (15) on to
clutch, brake or pawl.
stem (14) and place in the body. Carefully press gland (15)
into the body to prevent damage to the wiper. Install retain-
REMOVAL. To remove the valve stack, proceed as follows
ing ring (11).
(see Figure 5C-1):
NOTE
1. See General Removal at the beginning of this subsec-
The purpose of the wiper is to prevent dirt and water
tion.
from entering the valve, therefore the lips face out-
2. Remove the access cover on the top of the control con-
ward. The O-ring and seal prevent oil leakage from
sole. Clean the valve stack and the fittings with a suitable
the valve.
solvent. Dry the fittings with compressed air. This is done to
prevent dirt from entering open lines when the fittings are
removed.
INSTALLATION. To install the valve, proceed as follows (see
Figure 5C-1):
3. Disconnect and tag the hydraulic lines at the valve stack
and position the lines to avoid interference as the valve
1. Before actually installing the valve stack in the console,
stack is removed. Cap the lines and plug the valve ports to
check the following items (see Figure 5C-3):
prevent the entry of contaminants.
A. With valve handles in center (detent) position, adjust.
setscrews (01) down to valve stem to within 0.001
4. Remove the capscrews, nuts and lockwasher which se-
cure the valve stack to the control console. Lift the valve
inch. Then tighten hex nuts (02) to 13 ft-lbs torque.
stack out of the machine and place it on a clean work sur-
8. Adjust setscrew (03) to approximately 1/2 inch below
face.
bottom of manifold (04). Secure in place with jam nut
5. Remove individual valves by removing the hardware se-
(05).
curing the valve to the manifold.
2. Position the valve in the control console. Install and fully
tighten the capscrews, nuts and lockwashers.
REPAIR. To repair an individual valve, proceed as follows
3. Connect the hydraulic lines.
(see Figure 5C-2):
5C-1
