Caterpillar Cat 621G WHEEL SCRAPER (Prefix ANG) Service Repair Manual (ANG00001 and up)

1
Service Repair Manual
Models 621G Wheel Tractor
2
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Product WHEEL SCRAPER Model 621G WHEEL SCRAPER
ANG Configuration 621G WHEEL SCRAPER ANG00001-UP
(MACHINE)
Disassembly and Assembly 621G and 627G Wheel
Tractor-Scrapers Machine Systems Media Number
-RENR1558-00 Publication Date -01/12/2001
Date Updated -12/12/2001
i01541102
Service Brakes - Install SMCS - 4251-012 S/N -
ANG1-UP Installation Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-0510 Driver Group 1
B 5P-0167 Brake Spring Tool 1
1. Clean all parts and inspect all parts. If any
parts are worn or damaged, use new Caterpillar
parts for replacement.
Illustration 1
g00536690
3
2. Use Tooling (A) to install the inner lip seal
(16) to the spindle. Install the lip seal until
the lip seal is even with the inner surface of
the spindle. Install the lip seal with the spring
side of the lip seal away from the tooling. Pack
needle bearing (17) with 5P-0960 Molybdenum
Grease before installation. Use Tooling (A) to
install needle bearing (17) to the spindle.
Install the needle bearing until the needle
bearing is seated against the lip seal. Use
Tooling (A) to install outer lip seal (16).
Install the lip seal until the lip seal is seated
against the needle bearing. Install the lip seal
with the spring side of the lip seal toward the
tooling. Lubricate the lip seals with 5P-0960
Molybdenum Grease after installation.
Illustration 2 g00536689 3. Use Tooling (A) to
install outer lip seal (14) to the spindle.
Install the lip seal until the lip seal is even
with the surface of the spindle. Install the lip
seal with the spring side of the lip seal away
from the tooling. Pack needle bearing (15) with
5P-0960 Molybdenum Grease before installation.
Use Tooling (A) to install needle bearing (15) to
the spindle. Install the needle bearing until the
needle bearing is seated against the inner lip
seal. Use Tooling (A) to install outer lip seal
(14) to the spindle. Install the lip seal until
the lip seal is seated against the needle
bearing. Install the lip seal with the spring
side of the lip seal toward the tooling.
Lubricate the lip seals with 5P-0960 Molybdenum
Grease after installation.
Illustration 3 g00536684 4. Install two washers
(13) and brake camshaft (12) to the spindle.
4
Illustration 4 g00536683 5. Install slack
adjuster (10) to brake camshaft (12). Install
retaining ring (11) that secures slack adjuster
(10) to brake camshaft (12). Position slack
adjuster (10) to the brake actuator. Install pin
(9) that secures slack adjuster (10) to the brake
actuator. Install cotter pin (8) that secures pin
(9) to the slack adjuster (10) and the brake
actuator.
Illustration 5 g00536682 6. Position shoe
assemblies (4) to the spindle. Install two pins
(7) that secure shoe assemblies (4) to the
spindle. Position the flat spot on the pins with
the bolts in the spindle.
5
Illustration 6 g00536681 7. Position the felt
washers and two retainers (9) to two pins (7).
Install two springs (8) that secure the felt
washers and two retainers (9) to two pins (7).
Tighten bolt (6) that secures pin (7) to the
spindle. Repeat the procedure for the other pin.
Install wire (5) to two bolts (6) .
Illustration 7
g00536680
Improper assembly of parts that are spring loaded
can cause bodily injury. To prevent possible
injury, follow the established assembly procedure
and wear protective equipment.
8. Use Tooling (B) to install two springs (3) to
shoe assemblies (4) .
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• Illustration 8 g00536679
• Position two dust shields (2) to the spindle.
  Install the washers and four bolts (1) that
  secure two dust shields (2) to the spindle.
• Adjust the service brakes. Refer to the Testing
  and Adjusting, "Air System and Brakes" service
  manual for the correct adjustment procedure.
• End By Install the tire. Refer to Disassembly
  and Assembly, "Wheel, Wheel Bearings and Duo-
  Cone Seals - Install".

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sun Mar 14 212605 UTC0800 2021
8
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Product WHEEL SCRAPER Model 621G WHEEL SCRAPER
ANG Configuration 621G WHEEL SCRAPER ANG00001-UP
(MACHINE)
Disassembly and Assembly 621G and 627G Wheel
Tractor-Scrapers Machine Systems Media Number
-RENR1558-00 Publication Date -01/12/2001
Date Updated -12/12/2001
i01586922
Apron Cylinder - Remove SMCS - 5301-011 S/N -
ANG1-UP S/N - AYK1-UP Removal Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-4578 Half Flange 4
A 5H-4020 Cover 2

• Start By
• Release system pressure. Refer to Disassembly and
  Assembly, "System Pressure - Release".
• Remove apron lift. Refer to Disassembly and
  Assembly, "Apron Lift - Remove".
• NOTICE
• Care must be taken to ensure that fluids are
  contained during
• performance of inspection, maintenance, testing,
  adjusting and repair of the product. Be prepared
  to collect the fluid with suitable containers
  before opening any compartment or disassembling
  any component containing fluids.
• Refer to Special Publication, NENG2500,
  "Caterpillar Tools and Shop Products Guide" for
  tools and supplies suitable to collect and
  contain fluids on Caterpillar products.

9
Dispose of all fluids according to local
regulations and mandates.
Illustration 1 g00823649 1. Attach a suitable
lifting device around apron cylinder (1) .

• Illustration 2 g00823627
• Put identification marks on all lines, hoses,
  wires, and tubes for installation purposes. Plug
  all lines, hoses and tubes. This helps prevent
  fluid loss and contamination of the oil system.
• Remove two hose assemblies (2) and attach Tool
  (A) in order to prevent the apron cylinder from
  drifting during removal.
• Remove bracket assembly (3) and lower apron
  cylinder (1) to the ground.
• The apron cylinder weighs 191 kg (420 lb). The
  bracket assembly weighs 33.5 kg (73.85 lb).

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved.
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Product WHEEL SCRAPER Model 621G WHEEL SCRAPER
ANG Configuration 621G WHEEL SCRAPER ANG00001-UP
(MACHINE)
Disassembly and Assembly 621G and 627G Wheel
Tractor-Scrapers Machine Systems Media Number
-RENR1558-00 Publication Date -01/12/2001
Date Updated -12/12/2001
i01587260
Apron Cylinder - Install SMCS - 5301-012 S/N -
ANG1-UP S/N - AYK1-UP Installation
Procedure NOTICE Care must be taken to ensure
that fluids are contained during performance of
inspection, maintenance, testing, adjusting and
repair of the product. Be prepared to collect the
fluid with suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Caterpillar Tools and Shop Products
Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar
products. Dispose of all fluids according to
local regulations and mandates.
11

• Illustration 1 g00823627
• Install apron cylinder (1) and install bracket
  assembly (3) to the machine. The apron cylinder
  weighs 191 kg (420 lb). The bracket assembly
  weighs 33.5 kg (73.85 lb).
• Install two hose assemblies (2) .
• End By Install apron lift. Refer to Disassembly
  and Assembly, "Apron Lift - Install".

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sun Mar 14 212757 UTC0800 2021
12
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Product WHEEL SCRAPER Model 621G WHEEL SCRAPER
ANG Configuration 621G WHEEL SCRAPER ANG00001-UP
(MACHINE)
Disassembly and Assembly 621G and 627G Wheel
Tractor-Scrapers Machine Systems Media Number
-RENR1558-00 Publication Date -01/12/2001
Date Updated -12/12/2001
i01580347
Ejector Cylinder - Remove SMCS - 5305-011 S/N -
ANG1-UP S/N - AYK1-UP Removal Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1U-9200 Lever Puller Hoist (3/4 Ton Capacity) 3
B 9U-7536 Lift Stand (55 Ton) 1
B 4C-5809 Electric Hydraulic Pump Gp 1
C 8T-5255 Hydraulic Jack 1

• Start By
• Release system pressure. Refer to Disassembly and
  Assembly, "Systems Pressure - Release".
• Remove the overflow guard. Refer to Disassembly
  and Assembly, "Overflow Guard -
• Remove and Install".
• NOTICE
• Care must be taken to ensure that fluids are
  contained during
• performance of inspection, maintenance, testing,
  adjusting and repair of the product. Be prepared
  to collect the fluid with suitable containers

13
before opening any compartment or disassembling
any component containing fluids. Refer to Special
Publication, NENG2500, "Caterpillar Tools and
Shop Products Guide" for tools and supplies
suitable to collect and contain fluids on
Caterpillar products. Dispose of all fluids
according to local regulations and mandates.
NOTICE Keep all parts clean from
contaminants. Contamination of the hydraulic
system with foreign material will reduce the
service life of the hydraulic system
components. To prevent contaminants from entering
the hydraulic system, always plug or cap the
lines, fittings, or hoses as they are
disconnected. Cover any disassembled components
and clean them properly before assembly. Clean
the hydraulic system properly after any major
component exchange or especially after a
component failure, to remove any contamination.

• Illustration 1 g00821097
• Park the machine on a hard level surface. The
  ejector must be at the rear of the bowl in order
  to start the removal process.
• Install cribbing in order to level the scraper
  bowl. Level the scraper bowl in order to keep the
  ejector assembly from moving, when the ejector
  cylinder is disconnected.

14
Illustration 2 g00820583 3. Attach Tool (A) to
frame (1) and to ejector assembly (2) .
Illustration 3
g00820586
Illustration 4 g00820715 4. Attach Tool (A) to
ejector assembly (2) and to link assembly (3) .
15
Illustration 5 g00820588 5. Remove tube assembly
(4) from ejector cylinder (5) .
Illustration 6 g00820589 6. Remove hose assembly
(6) from ejector cylinder (5) .
16
Illustration 7
g00820590
7. Install Tool (B) to ejector cylinder (5) .
Illustration 8
g00820591
8. Remove retaining cap (7) and pin (8) .

• Illustration 9 g00820592
• Lower ejector cylinder (5) onto differential axle
  housing (9) .
• Use Tooling (A) in order to move the ejector
  assembly toward the front of the bowl.
• Note Keep tension on Tool (A) at all times in
  order to prevent unexpected movement of the
  ejector assembly.

17
Illustration 10 g00820594 11. Install Tool (C).
Install cribbing across ejector assembly (2) and
under ejector cylinder (5) .

• Illustration 11 g00820596
• Install a suitable lifting device to ejector
  cylinder (5) in order to remove cribbing.
• Lower ejector cylinder (5) until the rear of the
  ejector cylinder rests on ejector assembly
• (2) .

18
Illustration 12 g00820597 14. Attach a suitable
lifting device on the front of ejector cylinder
(5). Attach Tool (A) on rear of cylinder.
Illustration 13
g00820598

1. Remove retainer (7) and remove pin (8) .
2. Remove ejector cylinder (5). The ejector cylinder
   weighs 249 kg (550 lb).

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sun Mar 14 212852 UTC0800 2021
19
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Product WHEEL SCRAPER Model 621G WHEEL SCRAPER
ANG Configuration 621G WHEEL SCRAPER ANG00001-UP
(MACHINE)
Disassembly and Assembly 621G and 627G Wheel
Tractor-Scrapers Machine Systems Media Number
-RENR1558-00 Publication Date -01/12/2001
Date Updated -12/12/2001
i01582099
Ejector Cylinder - Install SMCS - 5305-012 S/N -
ANG1-UP S/N - AYK1-UP Installation
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1U-9200 Lever Puller Hoist (3/4 Ton Capacity) 3
B 9U-7536 Lift Stand (55 Ton) 1
B 4C-5809 Electric Hydraulic Pump Gp 1
C 8T-5255 Hydraulic Jack 1
NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting and repair of the
product. Be prepared to collect the fluid with
suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Caterpillar Tools and Shop Products
Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar products.
20
Dispose of all fluids according to local
regulations and mandates.
NOTICE Keep all parts clean from
contaminants. Contaminants may cause rapid wear
and shortened component life.

• Illustration 1 g00820597
• Attach a suitable lifting device on the front of
  ejector cylinder (5). Attach Tool (A) on rear of
  cylinder.
• Install ejector cylinder (5). Ejector cylinder
  (5) weighs 249 kg (550 lb).

Illustration 2
g00820598
3. Install pin (8) and install retainer (7) .
21

• Illustration 3 g00820596
• Lower ejector cylinder (5) until the rear of the
  ejector cylinder (5) rests on ejector assembly
  (2).
• Install a suitable lifting device to ejector
  cylinder (5) in order to install cribbing.
• Use Tooling (A) in order to move the ejector
  assembly toward the rear of the bowl.
• Note Keep tension on Tool (A) at all times in
  order to prevent unexpected movement of the
  ejector assembly.

Illustration 4 g00820594 7. Install Tool (C).
Remove cribbing from ejector assembly (2) .
22
Illustration 5
g00820592

• Illustration 6 g00820590
• Lower ejector cylinder (5) onto differential axle
  housing (9) .
• Use Tooling (A) in order to move the ejector
  assembly toward the rear of the bowl.
• Note Keep tension on Tool (A) at all times in
  order to prevent unexpected movement of the
  ejector assembly.
• Install Tool (B) to ejector cylinder (5) .

23
Illustration 7 g00820591 11. Install pin (8) and
install retaining cap (7) .
Illustration 8 g00820589 12. Install hose
assembly (6) to ejector cylinder (5) .
Illustration 9 g00820588 13. Install tube
assembly (4) to ejector cylinder (5) . End By
Install the overflow guard. Refer to Disassembly
and Assembly, "Overflow Guard - Remove and
Install".
Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sun Mar 14 212948 UTC0800 2021
24
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Product WHEEL SCRAPER Model 621G WHEEL SCRAPER
ANG Configuration 621G WHEEL SCRAPER ANG00001-UP
(MACHINE)
Disassembly and Assembly 621G and 627G Wheel
Tractor-Scrapers Machine Systems Media Number
-RENR1558-00 Publication Date -01/12/2001
Date Updated -12/12/2001
i02324954
Bowl Lift Cylinder - Remove and Install SMCS -
5303-010 S/N - ANG1-UP S/N - AYK1-UP Removal
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 138-7574 Link Bracket 2

• Start By
• Release system pressure. Refer to Disassembly and
  Assembly, "System Pressure - Release".
• Remove the carry-check valve. Refer to
  Disassembly and Assembly, "Check Valve (Carry and
  Quick Drop) - Remove".

Cylinders equipped with lock valves can remain
pressurized for very long periods of time, even
with the hoses removed. Failure to relieve
pressure before removing a lock valve or
disassembling a cylinder can result in personal
injury or death. Ensure all pressure is relieved
before removing a lock valve or disassembling a
cylinder.
25
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NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting and repair of the
product. Be prepared to collect the fluid with
suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Caterpillar Tools and Shop Products
Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar
products. Dispose of all fluids according to
local regulations and mandates.
NOTICE Keep all parts clean from
contaminants. Contaminants may cause rapid wear
and shortened component life.
Note Put identification marks on all lines, on
all hoses, on all wires, and on all tubes for
installation purposes.
Illustration 1 g00822358 1. Remove tube assembly
(1). Remove pin (2) .
27

• Illustration 2 g01161294
• Attach Tooling (A) and a suitable lifting device
  to bowl lift cylinder (4) .
• Remove pin assembly (3) .
• Remove bowl lift cylinder (4). The weight of bowl
  lift cylinder (4) is approximately 123 kg (270
  lb).
• Installation Procedure
• Table 2

Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 138-7574 Link Bracket 2

• Illustration 3 g01161294
• Attach Tooling (A) and a suitable lifting device
  to bowl lift cylinder (4). Position bowl lift
  cylinder (4). The weight of bowl lift cylinder
  (4) is approximately 123 kg (270 lb).
• Install pin assembly (3) .

28
3. Remove Tooling (A) from bowl lift cylinder (4)
.
Illustration 4
g00822358
4. Install pin (2). Install tube assembly (1)
. End By Install the carry-check valve. Refer to
Disassembly and Assembly, "Check Valve (Carry and
Quick Drop) - Install".
Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sun Mar 14 213044 UTC0800 2021
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