Manitowoc 999 Service And Maintenance Manual

Reference Only
TROUBLESHOOTING 999 SERVICE/MAINTENANCE MANUAL
10-2
Published 05-16-17, Control # 233-03
GUIDELINES
The following guidelines apply to all troubleshooting
operations:
• Do not remove cylinders or counterbalance valve(s)
from a cylinder until its working unit is restrained against
movement.
• Do not use your hands to check for hydraulic oil leaks.
Use a piece of cardboard to check for hydraulic oil leaks.
• Use a gauge of the correct pressure range when
checking hydraulic circuits.
• Use the standard test plug adapters (available from the
Manitowoc Crane Care Lattice Team) for electrical
testing.
• Check ground potentials when testing electric circuits for
continuity, voltage, or resistance. When checking
voltages, use ground point for circuit being checked. If
voltage does not register on multi-meter, use a known
ground. If a value is read, the ground of the circuit under
test is probably faulty.
• Check all terminal points for cleanliness and tighten
connections.
• Check pressures at the specified hydraulic component
ports.
• Check the motor pressure control pilot (PCP) valve on
the motor under test. Test the pump electric
displacement controls (EDC) on the pump under test.
• Check each pressure sender electric supply at the
system sender.
• Check the encoder electric supply at the test plug
adapter of the encoder under test.
• Check the correct operating limit electric supply by
viewing the diagnostic display in the operator's cab.
• Check the control handle electrical input and output
voltages at the control handle under test.
• Check the basic system electric supplies and cab power
relay at the fuse box mounted above the main electrical
junction box in the operator’s cab.
• Check the programmable controller (PC) input and
output cables at the connector pins.
TEST EQUIPMENT
The test equipment shown or described is available for
testing the Model 999 hydraulic or electrical systems. This
equipment can be purchased in kit form (with or without
carrying case) or separately, by contacting the Manitowoc
Crane Care Lattice Team.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English