Grove
Published 01-14-2021 Control # 707-01
2-29
TMS9000-2 SERVICE MANUAL
HYDRAULIC SYSTEM
2
HYDRAULIC SYSTEM OF THE
SUPERSTRUCTURE
Checking for Leaks
•
With the diesel engine running, make a visual inspection
for leaks and escaping hydraulic oil on the hydraulic
components of the superstructure (hydraulic cylinders,
lines, connections, hydraulic pumps, motors, valves,
and control block).
•
If leaks are detected, check the hydraulic oil level and
top up if necessary.
If damage cannot be rectified immediately further damage is
likely:
•
Inform Manitowoc Crane Care or your repair personnel.
CYLINDERS
General
This subsection provides descriptive information for all the
hydraulic cylinders used on this crane. The description of the
cylinder given here is for the cylinder itself. For information
on how the cylinder functions in the individual circuits, refer
to the Description and Operation of that circuit.
Maintenance
General
There must be a gap between the ends of each wear ring
when it is installed onto the piston (as applicable) or head. In
addition, each wear ring gap is to be located as follows:
Divide 360 degrees by the number of wear rings on the
component. The resulting value is the number of degrees
each wear ring gap is to be located with respect to each
other.
The approximate wear ring gaps are as follows:
Leakage Check
A hydraulic cylinder should not be disassembled unless it is
essential. The following checks will provide a means of
determining if a cylinder has a faulty or leaking piston seal.
WARNING
Pressurized Hydraulic Oil Hazard!
Never tighten leaking connections when the system is
under pressure. Only change seals, pipes and hoses
when the system is de-pressurized. Hydraulic oil can cut
skin.
CAUTION
Environmental Damage Hazard!
Immediately repair leakages in the hydraulic system or
have them repaired to ensure that no hydraulic oil
escapes, seeps into the ground or reaches waterways
when the crane is being used.
WEAR RING GAP
Head (or Piston) Size
Wear Ring Gap
Inch
mm
Inch
mm
1 to 4.75
25.4 to 120.7
0.125
3.18
5 to 10.0
127.0 to 254.0
0.187
4.75
greater than 10.0
greater than 254.0
0.250
6.35
Fo
r
Reference
Only
