SkyTrak 6036 Service Manual - Manual (Page 223)

Section 9 Hydraulic System
Model 6036/6036T S/N 9B0500 thru 14833 9-73
INLET
SECTION
OUTLET
SECTION
EXTEND/RETRACT
SECTION
RAISE/
LOWER
SECTION
4. Remove the capscrews (1, Fig. 9.42), nuts (2)
and lock washers (3) securing the control
valve to the frame. Remove the control valve
(4) from the forklift to a clean work area. Wipe
the exterior of the valve using a clean cloth
and an approved cleaning solvent such as
trichlorethylene.
2. Operate the control valve manually by
threading a 3/8 NC x 2" long capscrew into
the spool shift collar of each hydraulic
function, Fig. 9.46. Actuate all of the
hydraulic functions (boom raise/lower,
extend/retract) after the engine has
stopped to relieve any trapped pressure.
3. Remove dirt and grease from the hydraulic
lines and fittings and control valve using a
clean cloth and an approved cleaning solvent
such as trichlorethylene. Tag and disconnect
the hydraulic lines from the control valve and
cap or plug all connections to prevent system
contamination.
Fig. 9.41 Main Control Valve (Electronic Control)
a. Removal of Control Valve
NOTE: The following procedures are for out of
warranty service of the valve only. If the valve is
still under warranty it must be replaced as a
complete assembly.
The valve is mounted in the frame at vehicle
center line, to the right behind the cab, Fig. 9.41.
1. Park forklift on a level surface and engage
parking brake. Retract the boom and support
it in a horizontal position with blocking. Place
travel select lever in neutral and stop the
engine. Be sure the forklift is in a secure
position before servicing.
Warning
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.
b. Disassembly of Control Valve Into Sections
NOTE: The following procedures are for out of
warranty service of the valve only. If the valve is
still under warranty it must be replaced as a
complete assembly. Disassemble only to the
extent necessary to replace defective parts.
1. Remove all fittings, Fig. 9.43, from the control
valve.
2. Remove jam nut (1, Fig. 9.44) and hex nut (2)
from the tie rod (3) and carefully lift the outlet
section (4), the seal plates (5) and the working
sections (6 & 7) off of the tie rods (3). Remove
and discard all seals from the seal plate.
NOTE: When separating the sections, the load
sensing shuttle ball (11) may fall from the cavity
between the two working sections only. This ball
is a part of each seal plate kit and will be replaced
with a new part at assembly. DO NOT use this
ball between the inlet and raise/lower sections nor
between the outlet and extend/retract sections.
3. Unscrew the tie rods (3) from the inlet section
(8).
MACHINE
FRONT
1
4
3
2
MOUNTED IN FRAME AT
VEHICLE CENTERLINE
BEHIND CAB
1. Capscrew
2. Nut
3. Washer
4. Control Valve
Fig. 9.42 Control Valve Mounting