Manitowoc MLC650 Service Maintenance Manual

Reference Only
UNDERCARRIAGE MLC650 SERVICE/MAINTENANCE MANUAL
8-28
Published 09-09-16, Control # 229-09
CRAWLER TENSIONING ASSEMBLY AND
HYDRAULIC HAND PUMP
Operating the Hand Pump
See Figure 8-17 for the following procedure.
1. Before using the hand pump:
• Check that all fittings are tight and leak free.
• Check the oil level.
NOTE: The hand pump can be operated in any position
from horizontal to vertical as long as the hose end
of the pump is down.
2. To pressurize the crawler tensioning assembly and
extend the cylinder rod of the each jack cylinder (1),
perform the following.
a. Close the valve on the hand pump by turning it
clockwise (5) until finger tight.
b. Pump the handle up and down to build pressure.
The pressure is maintained until the valve is
opened.
To reduce the handle effort at high pressure, use
short strokes. Maximum leverage is obtained in the
last five degrees of the stroke.
NOTE: Erratic operation indicates air in the system. To
bleed the jack cylinders, see Remove Air from the
Crawler Tensioning Assembly on page 8-29.
3. To depressurize the crawler tensioning assembly, push
the pump handle down fully, then open the valve by
turning it counterclockwise (6).
WARNING
Personal Injury Hazard!
Serious personal injury may occur due to contact with
hydraulic oil that is under pressure. Be aware that the
following may occur:
• Because the hand pump is not vented, the pump,
cylinder, or hose can explode if the maximum
pressure rating is exceeded.
• The pump handle can kick back.
• Handle extensions can cause unstable operation.
To avoid injury, observe the following:
• Wear safety glasses and other personal protective
gear when operating the hand pump.
• Do not exceed the maximum pressure rating of
700 bar (10,000 psi)
• Do not set the pump relief valve higher than 700 bar
(10,000 psi).
• Do not attempt to return more oil to the pump than it is
capable of holding.
• Do not overfill the pump.
• Always keep your body to the side of the pump, away
from the line of handle force.
• Do not add extensions to the handle.

Manitowoc MLC650 Specifications

General

Brand	Manitowoc
Model	MLC650
Category	Construction Equipment
Language	English