1. Introduction
1 - 3
ROTATION GEAR
The complete mast, jib and cage assembly can be rotated to provide a maximum outreach
of 2.6m in the case of the MB20J and 2.96m in the case of the MB26J machine. This
dimension is measured from the centreline of rotation and is carried out by means of an
integral hydraulic motor driving a Worm Drive Unit, around a Slew Gear.
DRIVE & STEER SYSTEM
An electronic controller, mounted in the chassis, is pre-programmed to adjust the upper
speed limit of each individual function. The controller limits the rotational speed of the
electronic motor and oil pump, thereby limiting the maximum oil ow rate.
The following functions are controlled and driven by the electro-hydraulic system:
• Traction Drives (Fwd & Rev) mast stowed/mast raised.
• Steering and Jib elevation.
• Mast elevation, descent and rotation.
• The Jib descent function is gravity operated and is determined by built in ow regulators.
POWER SYSTEM
The Power System (Prime Mover) incorporates four 6V batteries driving a 4KW electro-
hydraulic pump. The pump drives all hydraulic cylinders and the traction drive motors. A
single multi-valve control block diverts the oil pressure to the individual actuators. The oil
ow rate is limited by the pre-programmed speed setting on the motor but is determined by
the position of the joystick in the Upper Control Box.
1.3 WORKSHOP PROCEDURES
All information contained in this manual is based on the latest product information available
at the time of printing. We reserve the right to make changes at any time without notice.
No part of this publication may be reproduced, stored in retrieval system, or transmitted,
in any form by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of the publisher. This includes text, gures, and tables.
Detailed descriptions of standard workshop procedures, safety
principles and service operations are not included. Note that this
manual does contain warnings and cautions against some specic
service methods that could cause personal injury, or could damage a
machine or make it unsafe.
Please understand that these warnings cannot cover all conceivable
ways in which service, whether or not recommended by Snorkel,
might be done, or of the possible hazardous consequences of each
conceivable way, nor could Snorkel investigate all such ways.
Anyone using service procedures or tools, whether or not
recommended by Snorkel must satisfy themselves thoroughly that
neither personal safety nor machine safety will be jeopardized. When
in doubt, contact your local distributor or Snorkel.
C A U T I O N
(66 Seiten)
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