6-18
Published 01-29-2014, Control # 496-00
SWING SYSTEM TMS800E SERVICE MANUAL
HYDRAULIC SWIVEL
Description
Each of the ports on the spool and case of the swivel is
stamped with the port number (see Table 6-1). The function
of each port is described in Table 6-1.
Theory of Operation
The hydraulic swivel allows oil to flow from the pumps to
various crane functions on the superstructure. All oil is
routed into the spool portion of the swivel where, through a
series of internally drilled passages, oil is transferred to
circumferential channels on the spool exterior. These
channels correspond with a mating port on the outer case of
the swivel. Each channel is separated by a series of nylon
and O-ring seals that prevent transfer of oil and pressure.
Return flow from the crane superstructure is accomplished in
the same manner through another set of ports.
Maintenance
Removal
1. Extend and set the outriggers. Ensure the crane is level
and the boom is over the front.
2. Elevate the boom and note at what boom angle, you
have the most clearance between the lift cylinder and
the turntable side plate. Shut down the engine.
3. Measure distance from top of the lift cylinder to base of
boom section where the lift cylinder attaches. Cut two
pieces of 10 x 10 cm (4 x 4 in) oak to fit.
NOTE: It might be necessary to raise the boom slightly to
allow installation of the blocking.
This blocking is to add extra support for the boom.
Any seepage or leakage in the holding valves or
internally in the cylinders will allow the boom to
settle over a period of time.
4. Use the oak blocking to block between the barrel of the
lift cylinder and the boom base section.
5. Tag and disconnect the hydraulic lines from the case of
the hydraulic swivel. Cap or plug all lines and openings.
6. Tag and disconnect the hydraulic lines and water lines
from the spool of the hydraulic swivel. Cap or plug all
lines and openings.
7. Tag and disconnect the water lines from the case of the
water swivel. Cap or plug all lines and openings.
8. Disconnect the swivel wiring harness connectors from
the carrier and superstructure receptacles and the
yellow ground wire from the weld stud on the carrier and
superstructure frame. If necessary, remove the electrical
swivel. Refer to Electrical Swivel, page 6-20.
NOTE: The hydraulic swivel weighs approximately 163.2
kg (437 lb). The hydraulic, water, and electrical
swivel combined weigh approximately 183 kg (490
lb).
It may be necessary to remove some drive line
components to remove the swivel.
Boom needs to be in the air to remove swivel after
it is loosened.
9. On the bottom of the swivel, bend the retainer tabs away
from the bolt heads.
10. Place adequate supporting device beneath swivel.
11. Remove the capscrews, washers, and bushings
securing the swivel barrel to the turntable base plate and
lower the swivel to the ground.
Item Description
1 Hydraulic Swivel
2 Slip Ring Assembly
3 Capscrew
4 Washer
5 Swivel Adapter
6 Hose Nipple
7 Retainer Plate
8Plate
9 Capscrew
10 Flatwasher
11 Swivel Adapter
12 Capscrew
13 Hex Nut
14 Center Post
Reference Only
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