SkyTrak 6036 Service Manual - Manual (Page 287)

8.71 Model 6036 Legacy
Hydraulic System
The main control valve assembly (Fig. 8-38, 1) consists
of various working sections with their own valve
assemblies, each providing a specific hydraulic function.
The section assemblies are the outlet (2), lift/lower (3),
extend/retract (4), mid-inlet/outlet (5), auxiliary hydraulics
(6), frame sway (7), attachment tilt (8) and load sense
outlet (9) sections.
Note: If the vehicle has auxiliary hydraulics installed, the
auxiliary hydraulics section will have relief valves
(Fig. 8-38, 10). If the vehicle does not have auxiliary
hydraulics installed, the relief valve ports will be plugged.
Figure 8-38 Main Control Valve
a. Main Control Valve Removal
1. Park the vehicle on a firm, level surface, fully retract
the boom, raise the boom, place the travel select
lever in (N) NEUTRAL, place the neutral lock lever in
the (N) NEUTRAL LOCK position, engage the park
brake switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and the steering wheel, stating
that the vehicle should not be operated. Refer to
Section 1.5, “Accident Prevention Tag Usage.”
3. Temporarily block up or support the raised boom.
4. Remove the transmission cover. Allow the hydraulic
fluid to cool.
5. With the engine OFF, operate all the hydraulic
functions to relieve trapped pressure.
6. Thoroughly clean the main control valve and
surrounding area, including all hoses and fittings,
before proceeding.
7. Place a suitable container to catch hydraulic fluid
drainage beneath the frame.
8. Label or otherwise mark and disconnect all the
hydraulic hoses, tubes and control cables at the
main control valve. Refer to Section 4.3.6, “Joystick
Assembly Replacement.”
MA7240
3
6
2
10
9
8
5
4
1
7
WARNING:
DO NOT get under a raised
boom unless the boom is blocked up. Always
block the boom before doing any servicing that
requires the boom to be up. Unexpected lowering
of the boom may cause death or serious injury.
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic pressure
before servicing any hydraulic component.