Skyjack SJIII 4740, Operating Manual

Page: 33 / 94

It is the responsibility of the operator to read, completely understand and follow all instructions and warnings
contained in this operating manual and on the aerial platform.
2. Turn main power disconnect switch to “ ” off
position.
3. Locate the brake manifold at the rear of the base.
4. Push in brake auto reset valve plunger (item 1).
5. Grasp brake hand pump (item 2) and rapidly
depress until firm resistance is felt. The brakes
are now released.
6. Remove wheel chocks or blocks, then push, winch
or tow MEWP to desired location.
WARNING
Brakes must be reengaged immediately
after reaching the desired location.
7. Position MEWP on a firm and level surface.
8. Chock or block wheels to prevent MEWP from
rolling.
9. Reengage the brake by pulling out the brake auto
reset valve plunger.
10. Close the free-wheeling valve.
2.6 Emergency Lowering Procedure
This section guides the operator on how to use the
emergency lowering system. This system allows
platform lowering in the event of an emergency or an
electrical system failure.
WARNING
Keep clear of scissors mechanism when
using emergency lowering system.
1. Remove any obstructions from a descending
platform.
2. Extension platform(s) (if equipped) may need to
be retracted or MEWP may need to be moved
to clear the obstruction. Refer to
Section 2.5 for
winching and towing procedures.
2
1
Figure 2-9. Emergency Lowering System
3. Push in “ ” base emergency stop button.
4. On hydraulic/electric tray, depress emergency
lowering switch (item 1) to activate the auxiliary
lowering valves. Pull out and hold the emergency
lowering valve handle (item 2) to fully lower
platform.
5. To restore normal operation:
a. Release emergency lowering switch (item 1) to
de-activate the auxiliary lowering valves.
b. Release emergency lowering valve handle
(item 2).
F
AMILIARIZA
TION
SJIII 4740
Page 33
Section 2 - Familiarization Procedures