Caterpillar Cat 350L TRACK-TYPE EXCAVATOR (Prefix 7RK) Service Repair Manual (7RK00001 and up)

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Product EXCAVATOR Model 350-A EXCAVATOR
7RK Configuration 350 350L TRACK-TYPE EXCAVATORS
7RK00001-UP (MACHINE) POWERED BY 3306 ENGINE
Disassembly and Assembly 350 AND 350 L EXCAVATOR
MACHINE SYSTEMS Media Number -SENR6148-04 Publicat
ion Date -01/11/2004
Date Updated -12/03/2010
SENR61480038
Swing Motor (Right) SMCS - 5058-010 5058-015
5058-016 5058 Remove Install Swing Motor
(Right) Start By a. remove swing control
valve NOTE To prevent oil loss and to keep dirt
and debris out of the hydraulic system, put plugs
in all hose assemblies as they are being
disconnected.
1. Disconnect five hose assemblies (1) at the
boom. Move the hose assemblies clear of the right
hand swing motor.
2. Put identification marks on four hose
assemblies (2) that are connect to the right hand
swing motor for installation purposes.
Disconnect the hose assemblies from the right
hand swing motor.
2

• Fasten a lifting sling and a hoist to right hand
  swing motor (3) as shown. Remove four socket
  head bolts (4) that hold the right hand swing
  motor to the swing drive. Carefully remove the
  right hand swing motor from the swing drive. The
  weight of the right hand swing motor is 64 kg
  (140 lb).
• Remove the O-ring seal from the right hand swing
  motor.
• NOTE The following steps are for the
  installation of the right hand swing motor.
• Make sure the mating surfaces of the right hand
  swing motor and the right hand swing drive are
  thoroughly clean.
• Check the condition of the O-ring seal used on
  the right hand swing motor and in the hose
  assemblies that connect to the right hand swing
  motor. If any of the seals are damaged, use new
  parts for replacement.
• Install the O-ring seal on the right hand swing
  motor.
• Install the right hand swing motor in the reverse
  order of removal.
• NOTICE
• Make sure the right hand swing motor is filled
  with clean hydraulic oil to the fill port before
  operation.

• Fill the hydraulic oil tank with oil to the
  correct level. Refer to the 350 350 L
  Excavators Operation Maintenance Manual for
  the correct filling procedure.
• End By
• a. install swing control valve

Disassemble Swing Motor (Left Right)
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Start By a. remove swing motor (left or
right) NOTE The disassembly procedure which
follows is for both the left and right swing
motors. 1. Make sure the outside of the swing
motor is clean and free of dirt and debris prior
to disassembly.

• Typical Example
• Put the swing motor on wood blocks as shown. The
  weight of the swing motor is 64 kg (140 lb). Put
  identification marks on each relief valve
  assembly (1) as to its location in the swing
  motor. Remove two relief valve assemblies (1).
• Remove the brake valve group from the body of the
  swing motor.

4. Remove the cushion crossover relief valve
group from the head of the swing motor.
4
5. Remove O-ring seal (3) and back-up ring (2)
from each relief valve assembly. NOTE For the
disassembly procedure for relief valve assemblies
(1), see Steps 25a through 25m. For the
disassembly procedure for the brake valve group,
see Steps 26a through 26e. For the disassembly
of the cushion crossover relief valve group, see
Steps 27a through 27d.
NOTICE Put identification marks on the
components of each make-up valve (4) as they are
removed from the head of the swing motor. The
components of each make-up valve must be
reinstalled in their original locations.
6. Remove two make-up valves (4) from the head of
the swing motor. Remove plugs (7), springs (6)
and valves (5). Remove O-ring seal (8) from each
plug (7).
5

1. Put an alignment mark on head (10) so it can be
   reinstalled in its original position on the swing
   motor body.
2. Remove four socket head bolts (9) and head (10)
   from the swing motor body.

9. Remove O-ring seal (11) and bearing (12) from
the head. If necessary, remove two pins (13)
from the head.

1. Remove 20 springs (14) from the piston.
2. Remove plate (15) from the barrel assembly.

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NOTE When Tooling (A) is installed to remove
piston (16), install the threaded rods into
holes (X) as shown. 12. Mark the position of
piston (16) in the swing motor body for assembly
purposes. Install Tooling (A) in piston (16) as
shown. Remove piston (16) from the swing motor
body with Tooling (A).
13. Remove three separator plates and two
friction plates (17) from the piston.
NOTICE During removal of barrel assembly (18)
from swing motor body, do not let the components
come apart. All parts in the barrel assembly must
be reinstalled in their original locations.
14. Put the swing motor on its side as shown.
Remove barrel assembly (18) from the shaft in
body (19).
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15. Disassemble barrel assembly (18) as
follows a. Put identification marks on nine
piston assemblies (20) as to their location in
plate (21) and barrel (22). Remove nine piston
assemblies (20) andplate (21), as a unit, from
barrel (22). Separate the piston assemblies from
the plate.
b. Remove bushing (23) from the barrel. Remove
the spacer from the bushing.
NOTE There are 12 pins (24) in barrel (22). Two
pins are used in each hole location. c. Remove 12
pins (24) from the barrel.
There is spring force against spacer (26). When
retaining ring (25) is removed, the spring force
will be released. To prevent possible personal
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injury, removal of the internal components in
barrel (22) should be performed in a press in
order to retain spring (27) and spacer (26).
NOTICE Spacer (26) and spacer (28) are different
in size. Put identification marks on the two
spacers as they are removed so they can be
reinstalled in their original locations.
d. Put barrel (22) in a press. Install a suitable
size piece of rectangular steel bar stock against
spacer (26). Put a slight amount of compression
on spacer (26) with the press. Remove retaining
ring (25), and slowly release the spring
compression. Remove spacer (26), spring (27) and
spacer (28) from barrel (22).
16. Remove O-ring seals (29) and (30) from the
body.
17. Remove retaining ring (31) that holds shaft
assembly (32) in the body.
18. Use a soft faced hammer to remove shaft
assembly (32) and retainer (33) from the body.
Remove the shaft assembly in the direction shown.
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19. Remove plate (34) from the body. It may be
necessary to use a hammer and punch to remove
the plate.
20. Remove ring (35) and retainer (33) from the
shaft.
21. Remove oil seal (36) from front cover (33).

1. Remove retaining ring (37) and bearing race (39)
   from the end of the shaft.
2. Remove two retaining rings (40) and the spacers
   (one on each side of the bearing) that position
   bearing (38) on the shaft.
3. Put the shaft in a press. Press the shaft out of
   bearing (38).
4. Disassemble relief valves (1) as follows

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a. Remove plug (41).
b. Remove O-ring seal (42) and back-up ring (43)
from the plug.
c. Remove spring (44).
d. Remove seat (45).
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e. Remove locknut (46).
f. Remove body (47).
g. Remove retainer (48).
h. Remove ball (49) from the larger of the two
holes in the body.
i. Remove insert (50) and insert (51) from body
(47). j. Remove back-up ring (52) and O-ring seal
(53) from body (47).
13
k. Remove spring (54) from body (55).
l. Remove retainer (56) from the body.
m. Remove valve (57) from the body.
14

• 26. Disassemble the brake valve group as follows
• Remove O-ring seals (64) and O-ring seal (67)
  from the valve body.
• Remove spring (65) and spool (60) from the valve
  body.
• Remove spring (66) and spool assembly (61) from
  the valve body.
• Remove ball (62) from the valve body.
• Remove plug (63) from the valve body.

• 27. Disassemble the cushion crossover relief
  valve group as follows
• Remove spring (68) from valve body (71).
• Remove ring (74), O-ring seal (75) and ring (76)
  from valve body (71).
• Remove plug (73) from valve body (71). Remove
  O-ring seal (72) from the plug.
• Remove shims (77), the spool assembly and springs
  (69) and (70) from valve body (71).

Assemble Swing Motor (Left Right)
NOTE The assembly procedure which follows is for
both the left and right swing motors.
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1. Make sure all parts of the swing motor are clean
   and free of dirt and debris prior to assembly.
   Check the condition of all parts in the swing
   motor. Guideline For Reusable Parts "Piston Pumps
   And Motors", Form No. SEBF8032-01 can be used as
   a guide for reconditioning and determining the
   reusability of some parts.
2. Check the condition of all O-ring seals and
   back-up rings used in the swing motor and the
   relief valves. If any of the seals are damaged,
   use new parts for replacement.

• Assemble the cushion crossover relief valve as
  follows
• Install springs (70) and (69), the spool assembly
  and shims (77) in valve body (71).
• Install O-ring seal (72) on plug (73). Install
  plug (73) in valve body (71). Tighten the plug to
  a torque of 147.2 10 Nm (110 7 lb ft).
• Install spring (68) in valve body (71).

16

• Assemble the brake valve group as follows
• Install plug (63) in the valve body.
• Install ball (62) in the valve body.
• Install spool assembly (61) and spring (66) in
  the valve body.
• Install spool (60) and spring (65) in the valve
  body.
• install O-ring seals (67) and (64) in the valve
  body.
• 5. Assemble relief valves (1) as follows

a. Install valve (57) in the body as shown.
b. Install retainer (56) on the body as shown.
c. Install spring (54) in body (55).
17
d. Install back-up ring (52) and O-ring seal (53)
on body (47). Make sure the seal and ring are in
the positions shown. e. Install insert (51) and
insert (50) in body (47) as shown.
f. Install ball (49) in the larger of the two
holes in body (47).
g. Install retainer (48) on the body assembly as
shown.
h. Install body (47).
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i. Install locknut (46) in body (47). Locknut
(46) must be tightened to a torque of 160 30
Nm (120 22 lb ft) after adjustment of the
valve is made.
j. Install seat (45) as shown.
k. Install spring (44).
l. Install O-ring seal (42) and back-up ring (43)
on plug (41) as shown.
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m. Install plug (41) in relief valve (1). Plug
(41) must be tightened to a torque of 120 10
Nm (90 7 lb ft). NOTE To adjust the
pressure settings of each relief valve (1), refer
to the 350 And 350 L Excavators Hydraulic System
Testing Adjusting module.

1. Install one of the retaining rings (40) on the
   drive shaft.
2. Press the drive shaft into bearing (38) until it
   makes contact with the retaining ring. Install
   the other retaining ring (40) on the other side
   of the bearing.
3. Install bearing race (39) and retaining ring (37)
   on the end of the drive shaft.

1. Install oil seal (36) in front cover (33) with
   tool (A). Install the seal so the lip will be
   facing away from the outside of the front cover,
   and until it makes contact with the counterbore
   in the front cover.
2. Install shaft assembly (32) in the body. Make
   sure bearing (38) is seated in the counterbore in
   the body.
3. Lubricate the lip of oil seal (36) with clean
   hydraulic oil. Install front cover (33) over
   shaft assembly (32) and into the body with a
   soft faced hammer.

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12. Install retaining ring (31) that holds the
shaft assembly in plate. Install ring (35) on
shaft assembly (32).

• 13. Put a thin coat of 5P-0960 Multipurpose
  Grease on the back side of plate (34). Install
  plate
• (34) in the body.
• Install O-ring seals (29) and (30) in the body as
  shown.
• Assemble barrel assembly (18) as follows

a. Install spacer (28), spring (27) and spacer
(26) in barrel (22). Put the barrel in a press.
Install a suitable size piece of rectangular
steel bar stock on spacer (26), and compress
spring (27) until retaining ring (25) can be
installed. Install retaining ring (25).
b. Install 12 pins (24) in barrel (22).
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c. Install the spacer in bushing (23). Install
bushing (23) on pins (24).
d. Put clean hydraulic oil on nine piston
assemblies (20). Install the piston assemblies in
their original bores in plate (21). Install the
plate with the piston assemblies in their
original bores in barrel (22).
NOTICE Do not let the barrel assembly fall apart
when it is installed in the body.
16. Put body (19) on its side. Install barrel
assembly (18) in the body.
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NOTICE The four tooth cut locations of each
friction plate must be in alignment. Also, the
four tooth cut locations of each separator plate
must be in alignment in the body.
17. Put clean hydraulic oil on three separator
plates and two friction plates (17). Install the
plates in alternating order in the body. Start
with a separator plate, and end with a separator
plate.
18. Install piston (16) in the body in its
original position. Threaded holes (X) can be used
as a guide during installation. If the piston is
hard to install because of O-ring seal
resistance, a soft faced hammer can be used as
an aid in installation.
19. Install 20 springs (14) in the piston.

1. Install two pins (13) and bearing (12) in head
   (10).
2. Install O-ring seal (11) on head (10).

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22. Put a thin coat of 5P-0960 Multipurpose
Grease on the face of plate (15) that makes
contact with the head. The grease will hold the
plate to the head. Install the plate on the head
in its original position as shown in the
illustration.
23. Put head (10) in its original position on the
body. Install four socket head bolts (9) that
hold it. Tighten the socket head bolts to a
torque of 430 43 Nm (320 32 lb ft).
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NOTICE Make sure to install each make-up valve
(4) in its original position in the head.
24. Install two make-up valves (4) in the head.
Install O-ring seals (8) on plugs (7). Install
valves (5), springs (6) and plugs (7). Tighten
plugs (7) to a torque of 220 25 Nm (160 18
lb ft).
NOTICE Make sure to install each relief valve
assembly (1) in its original position in the
head.

• Install back-up ring (2) and O-ring seal (3) on
  each relief valve assembly (1) as shown in Photo
  C48291P1.
• Install relief valve assemblies (1) in the head.
  Tighten the relief valve assemblies to a torque
  of
• 180 10 Nm (135 7 lb ft).

27. Reinstall the cushion crossover relief valve
in the head of the swing motor.
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28. Reinstall the brake valve group on the swing
motor. NOTICE To prevent damage to the swing
motor, the unit must be filled with hydraulic
oil to the fill port prior to operation. Refer to
the 350 350 L Excavators Operation
Maintenance Manual for the correct filling
procedure.
End By a. install swing motor (left or right)
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Shutdown SIS
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Product EXCAVATOR Model 350-A EXCAVATOR
7RK Configuration 350 350L TRACK-TYPE EXCAVATORS
7RK00001-UP (MACHINE) POWERED BY 3306 ENGINE
Disassembly and Assembly 350 AND 350 L EXCAVATOR
MACHINE SYSTEMS Media Number -SENR6148-04 Publicat
ion Date -01/11/2004
Date Updated -12/03/2010
SENR61480039
Swing Drives (Left Right) SMCS - 5459-010
5459-015 5459-016 5459 Remove Install Swing
Drives (Left Right)

• Start By
• a. remove swing motor (left or right)
• NOTE The removal and installation procedure for
  the left swing drive and the right swing drive
  is the same. In the following procedure, the
  right swing drive is being removed and installed.
• Thoroughly clean around the mounting area of the
  swing drive prior to removal.
• Drain the oil from the swing drive into a
  suitable container for storage or disposal. The
  capacity of each swing drive is 8 liters (2.1
  U.S. gal).

3. Fasten Tool (A) and a hoist to swing drive (1)
as shown.
29

• Remove 20 bolts (2) and the washers that hold the
  swing drive in position. Remove the two corks
  from the forcing screw holes in the swing drive
  housing. Install suitable size forcing screws in
  the threaded forcing screw holes. Tighten the
  forcing screws evenly to separate the swing drive
  from the main frame.
• Remove swing drive (1) from the machine. The
  weight of the swing drive is 308 kg (680 lb).
  NOTE The following steps are for the
  installation of the swing drive.
• Thoroughly clean the mating surfaces of the main
  frame and the swing drive housing.
• Put 5P-3931 Anti-Seize Compound on the locating
  dowel in the main frame.
• Put 1U-8846 Gasket Maker on the mating surface of
  the main frame and the swing drive housing.
• NOTE During installation, the locating dowel for
  the swing drive may come out of the swing drive
  housing.
• Fasten Tool (A) and a hoist to swing drive (1).
  Put the swing drive in its original position in
  the main frame. If the locating dowel comes out
  of the swing drive housing, it can be reinstalled
  with a hammer after the swing drive is in place.
• Put 9S-3263 Thread Lock on the threads of 20
  bolts (2). Install the 20 bolts and washers that
  hold the swing drive in position. Reinstall the
  two corks in the forcing screw holes in the swing
  drive housing.
• After installation of the swing motor, fill the
  hydraulic oil tank and the swing drive with oil
  to the correct level. Refer to the 350 350 L
  Excavators Operation Maintenance Manual for the
  correct filling procedures.
• End By
• a. install swing motor (left or right)

Disassemble Swing Drive (Left Right)
Start By a. remove swing drive (left or right)
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NOTE The disassembly procedure which follows is
for both the left and right swing drives.

1. Fasten the swing drive to Tool (A) as shown. The
   weight of the swing drive is 308 kg (680 lb).
2. Put an alignment mark on the cover, ring gear and
   main housing of the swing drive for assembly
   purposes.
3. Remove 16 bolts (1) and the washers that hold
   cover (2) to the ring gear and housing of the
   swing drive.
4. Fasten Tool (B) and a hoist to cover (2). Remove
   the cover. The weight of the cover is 16 kg (35
   lb).

5. Remove sun gear (3) from the carrier assembly.

1. Remove carrier assembly (4).
2. Disassemble carrier assembly (4) as follows

31
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