Caterpillar Cat 621E WHEEL SCRAPER (Prefix 2TF) Service Repair Manual (2TF00001-00971)

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030002
Final Drive Planetary Carriers SMCS - 4092-010
4092-017 Remove And Install Final Drive
Planetary Carriers Start By a. remove drive axles
Hold the carrier assembly level when it is
removed. The pins and gears will fall out of the
carrier if the assembly is not held level.
1. Remove twenty-two nuts (1) and washers.
2

• Fasten a hoist to carrier assembly (2) and remove
  it from the hub assembly. Weight of the carrier
  assembly is approximately 150 kg (330 lb).
• Check the condition of the O-ring seal on the
  carrier. If the seal has damage, use a new part
  for replacement.
• NOTE The following steps are for the
  installation of the final drive planetary
  carriers.

Hold the carrier assembly level when it is
installed. The pins and gears will fall out of
the carrier if the assembly is not held level.

• Fasten a hoist to carrier assembly (2). Install
  the gear end of the drive axle in the carrier
  assembly as shown. The axle is used to hold the
  carrier assembly level and to help put the gears
  in the carrier assembly in alignment with the
  hub assembly.
• Put the carrier assembly in position in the hub
  assembly. Remove the hoist and drive axle.
• Install the twenty-two nuts that hold the carrier
  assembly in position.
• Tighten the nuts to a torque of 370 50 Nm (273
  37 lb ft).
• End By
• a. install drive axles
• Disassemble And Assemble Final Drive Planetary
  Carriers
• Start By
• a. remove final drive planetary carriers

3

1. Put the final drive planetary carrier on wood
   blocks as shown.
2. Remove pin (1) and the ring as a unit that holds
   gear (3) and two spacers (2) in position in the
   carrier assembly.
3. Remove the gear and two spacers from the carrier
   assembly.
4. Remove the other two gears from the carrier
   assembly as in Steps 1 through 3.

• Remove two bearings (4) and spacer (5) from each
  gear.
• NOTE The following steps are for the assembly of
  the final drive planetary carriers.
• Install two bearings (4) and spacer (5) in each
  gear (3).
• Put a spacer (2) on each side of the gear. Put
  the gear in position in the carrier assembly.
• Install the ring and pin (1) that holds the gear
  in position. Turn pins (1) in the carrier until
  the flat side of the pins are toward the outside
  of the carrier as shown.
• Install the other two gears in the carrier
  assembly as in Steps 7 and 8. End By
• a. install final drive planetary carriers

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030003
Final Drive Gears And Hubs SMCS - 4054-010
4055 Remove And Install Final Drive Gears And
Hubs
Start By a. remove final drive planetary carriers
Put wood blocks under the outside edge of tire as
supports to hold it in correct position before
the hub and gear are removed. If supports are
not used, the tire will fall and personal injury
can be the result.
1. Remove bolts (2), ring (3) and the shims from
the end of the axle housing.
5

• If retainer (1) is in the position shown, it must
  be removed to permit the installation of tool (A)
  in the groove of the gear.
• Fasten tool (A) to a hoist. Put tool (A) in the
  groove of gear (4). Remove the gear and hub as a
  unit from the end of the axle housing. Weight of
  the unit is approximately 88.5 kg (195 lb).
• Remove the retainers (1) that hold the gear and
  hub together. Remove the gear from the hub.
  Weight of the gear is 43 kg (95 lb). Weight of
  the hub is 45 kg (100 lb).
• NOTE The following steps are for the
  installation of the final drive gears and hubs.
• NOTE Before adjustment of the wheel bearings is
  started, check to be sure the bearing cups have
  a tight seat against the bottom of the bore in
  the wheel. Use a 0.03 mm (.001 in) or 0.05 mm
  (.002 in) feeler gauge to check for any
  clearance behind the bearing cup. If any
  clearance is found, use a bearing driver or
  press to move the bearing cup until it has a
  tight seat with no clearance.
• Put gear (4) in position over the hub. Install
  the bolts, lock and retainers (1) that hold the
  unit together.
• Fasten a hoist and tool (A) to the gear and hub.
  Put the unit in position on the end of the axle
  housing.

• Make an adjustment to the wheel bearings as
  follows
• Install ring (3) without shims. Install three
  bolts (2) the same distance apart to hold the
  ring.
• Tighten the bolts evenly to a torque of 35 Nm
  (25 lb ft).
• Turn the wheel and tighten the three bolts again
  to a torque of 70 7 Nm (50 5 lb ft) as the
  wheel is turned. Tighten each bolt only once.

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• Use a depth micrometer and measure through the
  threaded holes in ring to find the average
  depth. Make a record of the average depth.
• Remove ring (3) and measure the thickness of the
  ring at the holes with the threads to find an
  average thickness. Make a record of the average
  thickness.
• Find the average difference between the two
  average measurements. This difference is the
  distance between the end of the axle housing and
  ring. Make a record of this distance.
• The average difference in Step 7f plug 0.30 mm
  (.012 in) is the amount of shims to install
  between the end of the axle housing and ring.
• Install the correct amount of shims, ring (3) and
  the bolts that hold the ring. Turn the wheel and
  tighten the bolts to a torque of 275 27 Nm
  (200 20 lb ft) as the wheel is turned. Tighten
  each bolt only once.
• To make an adjustment to the wheel bearings off
  the machine, see Adjustment Of Wheel Bearings
  "OFF" Machine in Specification, Form No.
  REG01621.
• End By
• a. install final drive planetary carriers

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030004
Tires And Wheels, Wheel Bearings And Duo-Cone
Seals SMCS - 4200 4208-011 4208-012 Remove
Tires And Wheels, Wheel Bearings And Duo-Cone
Seals Start By a. remove final drive gears and
hubs
Put wood blocks under the outside edge of the
tire as supports to hold it in the correct
position before the outer bearing cone is
removed. If supports are not used, the tire will
fall and personal injury can be the result.
1. Remove bearing cone (1).
9

1. Put the forks of a lift truck under the tire as
   shown. Fasten the tire and wheel to the lift
   truck so it does not fall when it is removed.
2. Remove the wood block supports from under the
   tire. Remove tire and wheel (2). Weight of the
   tire and wheel is approximately 900 kg (2000 lb).

1. Remove Duo-Cone seal (3) from the wheel.
2. Remove the two bearing cups from the wheel.

1. Remove Duo-Cone seal (6).
2. Remove bearing cone (5) and spacer (7).
3. Remove retainer assembly (4).
4. Remove the O-ring seal from the retainer
   assembly. Check the condition of the seal. If the
   seal has damage, use a new part for replacement.

10
Install Tires And Wheels, Wheel Bearings And
Duo-Cone Seals
1. Install a new O-ring seal in the retainer
assembly.

1. Install retainer assembly (4) on the axle housing
   as shown.
2. Make sure the Duo-Cone seals are clean and dry.
   Make sure the metal surfaces that the seals make
   contact with are clean and dry. Put clean oil on
   the contact surfaces of the metal seals.

4. Install the Duo-Cone seal in the retainer
assembly with tool (A). See the topic, Duo-Cone
Floating Seals, Installation.

1. Install spacer (7) on the axle housing as shown.
2. Install bearing cone (5) on the axle housing as
   shown.

11

1. Lower the temperature of the two bearing cups and
   install them in the wheel.
2. Make sure the Duo-Cone seals are clean and dry.
   Make sure the metal surfaces that the seals make
   contact with are clean and dry. Put clean oil on
   the contact surfaces of the metal seals.

1. Install Duo-Cone seal in the wheel with tool (A).
2. Put the tire in position on the forks of a lift
   truck. Fasten the tire to the lift truck so it
   does not fall.
3. Put the tire in position on the axle housing.

12. Install the outer bearing cone (1).
Put wood blocks under the outside edge of the
tire as supports to hold the tire in the correct
position before the lift truck is moved away. If
supports are not used, the tire will fall and
personal injury can be the result.
12
End By a. install final drive gears and hubs
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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030005
Brake Shoes And Brake Drums SMCS - 4252-012
4252-011 4253 Remove Brake Shoes And Brake Drums
Start By a. remove final drive gears and
hubs 1. Remove the tire and wheel. See the
topic, Remove Tire and Wheel, Wheel Bearings and
Duo- Cone Seals.
2. Remove shield (1) and shield (3).
Both brake springs are under tension. Wear safety
glasses or goggles when removing these springs.
Use only the correct tooling for this
14
procedure, do not substitute. Check tooling (A)
for any wear or damage. Do not attempt to remove
brake springs with damaged tooling.
3. Remove springs (2) with tool (A).

1. Remove lockwire (7) and two bolts (5).
2. Remove spring (4), retainer (6) and the felt
   washer from one side of each pin.

6. Remove two pins (8) and brake shoes (9). The
weight of each brake shoe is 21 kg (46
lb.). NOTICE Remove the Duo-Cone seal from the
wheel assembly before the brake drum is removed.
The brake drum can cause damage to the Duo-Cone
seal when it is removed.
15
7. Remove nuts (10) and lockwashers that hold the
brake drum in position.

1. Fasten a hoist to brake drum (11) and remove it
   from the wheel assembly. Weight of the brake
   drum is 54.7 kg (120 lb).
2. Remove guard (12) from the wheel assembly.

Install Brake Shoes And Brake Drums

1. Put guard (12) in position in the wheel assembly.
2. Fasten a hoist to brake drum (11) and put it in
   position in the wheel assembly. Install the
   washers and nuts that hold it. Tighten the nuts
   to a torque of 120 7 Nm (90 5 lb ft).

16
3. Put upper brake shoe (9) in position on the
axle housing. Install pin (8) that holds the
brake shoe in position.

1. Install the felt washers, retainer (6) and spring
   (4).
2. Install the lower brake shoe as in Steps 3 and 4.

6. Install two bolts (5) and lockwire (7) that
hold pins (8) in position.
Both brake springs are under tension. Wear safety
glasses or goggles when installing these
springs. Use only the correct tooling for this
procedure, do not substitute. Check tooling (A)
for any wear or damage. Do not attempt to
install brake springs with damaged tooling.
17
7. Install two springs (2) as shown with tool (A).

• Install two shields (13).
• Install the Duo-Cone seal in the wheel assembly.
  Install the tire and wheel. See the topic,
  Install Tire and Wheel, Wheel Bearings and
  Duo-Cone Seals.
• End By
• a. install final drive gears and hubs

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030006
Brake Camshafts And Slack Adjusters SMCS -
4261-012 4261-011 Remove Brake Camshaft And
Slack Adjuster 1. Remove the tire and wheel. See
the topic, Remove Tires and Wheels, Wheel
Bearings and Duo- Cone Seals.

• NOTE The brake shoes are removed for better
  photo illustration of the brake camshaft and
  slack adjuster.
• Put small wood blocks between the brake shoes and
  axle housing before the brake camshaft and slack
  adjuster is removed. The wood blocks will hold
  the brake shoes in position.
• Remove pin (1) to disconnect the adjuster
  assembly from the brake rotochamber.

19

• Remove ring (4) from the groove in the camshaft,
  and remove the washer.
• Pull camshaft (6) out of the axle housing as
  shown.
• NOTE Oil will drain out of location (2) when the
  camshaft is pulled out of the differential case
  and axle housing.
• Remove the camshaft and slack adjuster (3).
• Remove washer (5) from the camshaft.

8. Remove three seals (8) and two bearings (7)
from the axle housing.
Install Brake Camshaft And Slack Adjuster

1. Install bearing (9) in the axle housing with tool
   (A).
2. Install the lip type seal in the axle housing
   with tooling (A). Install the seal with the lip
   of the seal toward the differential case as
   shown.
3. Install bearing (10) in the axle housing with
   tooling (A). Install the bearing until it is 7.14
   mm (.281 in.) below the outside surface of the
   axle housing.

20
4. Install the two lip type seals on each side of
bearing (10) with tooling (A). Install the seals
even with the outside surface of the axle
housing and with the lips of the seals toward the
differential case as shown.

1. Install washer (5) on camshaft (6). Slide the
   camshaft through the axle housing and install the
   washer and ring (4) on the camshaft.
2. Put slack adjuster (3) in position on the
   camshaft and install the end of the camshaft in
   the axle housing.
3. Put ring (4) in the groove on the camshaft.

1. Put the slack adjuster in position in the rod of
   the brake rotochamber. Install pin (1) and the
   cotter pin.
2. Install the tires and wheels. See the topic,
   Install Tire and Wheels, Wheel Bearings and Duo-
   Cone Seals.

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030007
Adjustment Of Brakes SMCS - 4253
4261-025 Adjustment Of Brakes NOTE The maximum
amount of movement distance (A) of the rod
before adjustment is needed is 76.2 mm (3.00 in).

1. Loosen screw (1).
2. Turn shaft (2) until the movement distance (A)
   of the rod is 41.1 mm (1.62 in.) (cold) when the
   brakes are engaged.
3. Tighten screw (1).

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030008

• Axle Housing
• SMCS - 3260-010
• Remove And Install Axle Housings
• Start By
• remove brake shoes and brake drums
• remove brake camshafts and slack adjusters
• Drain the oil from the differential case.

1. Fasten axle housing (2) to the fork of a lift
   truck as shown.
2. Remove nuts (1) and washers that hold the housing
   in position. Remove the housing. The weight of
   the housing is approximately 190 kg (422 lb).

23

• Check O-ring seal (3) for damage. If the seal has
  damage, use a new part for replacement.
• NOTE The following steps are for the
  installation of the axle housings.
• Install O-ring seal (3) on the axle housing.
• Fasten axle housing (2) to the fork of a lift
  truck. Put the housing in position on the studs
  in the differential case.
• Put 9M3710 Anti-Seize Compound on the threads of
  the studs. Install the nuts that hold the axle
  housing in position. Tighten the nuts to a torque
  of 295 14 Nm (215 10 lb ft).
• Fill the differential case with oil to the
  correct level. See the Operation and Maintenance
  Manual.
• End By
• install brake camshafts and slack adjusters
• install brake shoes and brake drums

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030009
Brake Actuator SMCS - 4262-017 4262-010 Remove
And Install Brake Actuator
To prevent personal injury, do not disconnect any
air lines until the air pressure is zero.
1. Drain the air from the air tanks.
2. Disconnect air hose assemblies (1) and (2)
from the brake actuator.
25

• Loosen Screw (3). Loosen shaft (4) until the pin
  that holds the rod in the actuator to the slack
  adjuster can be removed.
• Remove the cotter pin and pin (5).
• Remove nuts (7) that hold the brake actuator in
  position, and remove brake actuator (6).
• NOTE The following steps are for the
  installation of the brake actuator.
• Position brake actuator (6) on the bracket, and
  install the nuts that hold it. Tighten nuts (7)
  to a torque of 180 25 Nm (135 18 lb ft).
• Connect air hose assemblies (1) and (2) to the
  brake actuator.
• Put the slack adjuster in position on the rod for
  the brake actuator, and install pin (5) and the
  cotter pin that holds it.
• Make an adjustment to the brakes. See the topic,
  Adjustment Of Brakes.

Disassemble And Assemble Brake Actuator
Start By a. remove brake actuator
26
1. Remove yoke (1), locknut (19), boot (3), and
retainer (4). Remove clamp (12), plate (11), and
diaphragm (9).
To prevent personal injury, remove nut (2) very
slowly to be certain all the pressure on the
service brake spring is released.
2. Remove the locknut for nut (2). Remove nut (2)
slowly to release pressure on service brake
spring (7). Remove rod (10), retainer (15),
spring (7) and the guide.
27
Be very careful when using tooling (A) to
compress and release parking brake spring (6).
Serious injury could result if care is not used
during this process.

1. Install tooling (A) to compress parking brake
   spring (6) slightly. Remove eight bolts (13),
   (photo shows bolts removed). Remove nut (22)
   slowly to release pressure on spring (6).
2. Remove tooling (A). Remove spring (6). Remove
   seal and wiper (17) from piston (5).

• Remove wiper (23) and seal (24) from the cylinder
  assembly (14).
• NOTE The following steps are for the assembly of
  the brake actuator.
• Clean and inspect all parts. Make a replacement
  of all parts that are worn or damaged.
• Install seal (24) and wiper (23) in the cylinder
  assembly (14).

Serious injury could result if tooling (A) is not
used correctly and safely to compress parking
brake spring (6).
8. Install seal and wiper (17) in piston (5).
Install spring (6). Install tooling (A) to
compress the parking brake spring.
28

• Slowly, tighten nut (22) and compress parking
  brake spring (6). Install eight bolts (13),
  (photo shows bolts removed).
• Install the guide, spring (7), retainer (15) and
  rod (10).
• Install and tighten nut (2) to put pressure on
  the service brake spring (7). Tighten nut (2)
  until approximately 1/161/8 51.5 to 54.0 mm (2
  to 2 in) of rod (10) is out of the nut. Install
  the locknut on the rod above nut (2).
• Install diaphragm (9), plate (11), and clamp.
  Install retainer, boot (3), locknut (19), and
  yoke (1).
• End By
• a. install brake actuator

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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
2TF Configuration 621E TRACTOR/SCRAPER / POWER
SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030010
Brake Control Valve SMCS - 4265-017
4265-010 Remove And Install Brake Control
Valve 1. Let the air out of the reservoirs.
2. Remove five bolts (1), and open access door
(2).
3. Remove line (3), and remove two lines (4).
Disconnect linkage lever (5).
30
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NOTE On 627E Tractors, disconnect two electrical
wires (6) and remove switch (7). Remove line (8).

• Remove bolts (9), and remove brake control valve
  (10).
• NOTE The following steps are for the
  installation of the brake control valve.
• Position the brake control valve, and install
  bolts (9).
• Connect linkage lever (5). Install two lines (4),
  and install line (3).
• NOTE On 627E Tractors, install line (8). Install
  switch (7), and connect two electrical wires (6).
• Close access door (2), and install five bolts
  (1).
• Disassemble And Assemble Brake Control Valve
• Start By
• a. remove brake control valve

33

• Remove bolt and washer (3), seat (4), retainer
  (5), rubber spring (2), piston assembly (18), and
  spring (6) from the body.
• Remove seal (1) from piston assembly (18).
• Remove ring (13), bolt (12), washer (11),
  diaphragm (10), and spring (7). Remove seat (8),
  O- ring seal (9), spring (15), retainer (16) and
  valve (17).
• Remove seal (14) from valve (17). Check the
  condition of all the seals. If any are worn or
  damaged, make a replacement of the seal with a
  new part.
• NOTE The following steps are for the assembly of
  the brake control valve.
• Install seal (14) on valve (17). Install valve
  (17), retainer (16), spring (15), O-ring seal
  (9), and seat (8).
• Install spring (7), diaphragm (10), washer (11),
  bolt (12), and ring (13).

34

• Install seal (1) on piston assembly (18). Install
  spring (6), piston assembly (18), retainer (5),
  seat (4), and bolt and washer (3).
• End By
• a. install brake control valve

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