Caterpillar Cat 621E WHEEL TRACTOR (Prefix 2PD) Service Repair Manual Instant Download.pdf

Shutdown SIS
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Product: WHEEL TRACTOR
Model: 621E WHEEL TRACTOR 2PD
Configuration: 621E Wheel Tractor-Scraper 2PD01011-UP (MACHINE) POWERED BY 3406 Engine
Disassembly and Assembly
3406C DIESEL ENGINES FOR CATERPILLAR BUILT MACHINES
Media Number -SENR6409-02 Publication Date -01/07/2006 Date Updated -19/05/2015
SENR64090009
Fuel Injection Pumps
SMCS - 1251-011; 1251-012; 1251-017
Remove Fuel Injection Pumps
Start By:
a. remove fuel injection lines
1. Remove the plug, and move the race until Tool (A) can be installed to hold the rack in the center
position. The rack must be in the center position to remove the fuel injection pumps.
To prevent possible personal injury carefully follow the steps below.
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2. Put Tool (B), except for the 8T5287 Wrench, in position on the fuel pump housing as shown.
Lower the handle to center the adjusting screw with the fuel line seat. With the handle down in the
locked position, the adjusting screw must just be in contact with fuel line seat (1). If force is needed
to lower the handle or there is a gap, remove the tooling, and make an adjustment to the screw.
3. Loosen bushing (2) 1/4 of a turn.
4. Put Tool (B) in position on the pump housing with the handle down in the locked position as
shown.
5. Remove bushing (2) from the pump housing.
6. Carefully and slowly lift the handle to release the spring force. Remove the tooling.
7. Install Tool (C) on fuel pump (4) as shown.
8. Remove seal (3) and fuel pump (4) from the fuel pump housing.
9. Remove spacers (5) from the pump housing.
NOTE: There must be a pump installed on either side of the pump to be removed to install Tool (B).
If there is no pump, take a pump already removed, and remove the spring so there will be no spring
force, and install it in the pump housing. See Install Fuel Pump.
NOTE: Spacers (5) are the same thickness for each fuel injection pump so they can be mixed. The
fuel injection pump plungers and barrels are sets and cannot be mixed.
Install Fuel Injection Pumps
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1. Install spacers (5) in the fuel pump housing.
2. Move the rack until Tool (A) can be installed to hold the rack in the center position. The rack
must be in the center position to install the fuel injection pumps.
3. Install a fuel pump without its spring so that Tool (B) can be installed. See Step 5 for correct fuel
pump installation.
4. Install Tool (C) on the bonnet of the fuel pump as shown.
5. Install the fuel pump in the pump housing with the saw cut (slot) (9) in the gear in alignment with
small pin (6) in the lifter assembly and groove (8) in the barrel in alignment with large pin (7) in the
pump housing.
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6. Install the seal and bushing (2) on the fuel pump.
7. Put Tool (B) in position on the fuel pump housing as shown.
8. Lower the handle slowly and carefully. If the fuel pump is not installed correctly, the handle will
not go all the way down. Do not try to use force on it. Remove and install the tooling and the fuel
pump again.
9. Make sure the seal is in its correct position, and start to tighten bushing (2). Remove the tooling,
and tighten the bushing to a torque of 260 ± 15 N·m (190 ± 10 lb ft). Back off 180 degrees and
tighten the bushing again to a torque of 260 ± 15 N·m (190 ± 10 lb ft).
Typical Example
10. After each fuel pump has been installed, follow the steps below to check total race travel to
make sure each pump has been installed correctly.
a. Install Tool (D) on the fuel pump housing as shown and zero the dial indicator.
b. Remove Tool (A) from the fuel pump housing.
c. Move rack (10) in and out of the fuel pump housing to measure rack travel. Rack travel is
approximately 9.62 mm (.379 in) in the plus (full fuel) direction and 10.40 mm (.410 in) in the
minus (shutoff) direction. If this measurement is not obtained, center the rack, install Tool (A), and
remove and install the fuel pump again.
NOTE: One tooth off and rack travel is approximately 6.35 to 6.82 mm (.250 to .269 in) in the plus
direction and 7.02 to 7.05 mm (.276 to .278 in) in the minus direction.
End By:
a. install fuel injection lines
Disassemble & Assemble Fuel Injection Pumps
See SMHS8378 for the correct tool usage.
Start By:
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a. remove fuel injection pumps
NOTICE
Be careful when the injection pumps are disassembled. Do not damage
the surfaces of the plungers, barrels and bonnets. Any scratches will
cause leakage inside the fuel injection pump. The plunger and barrel
for each pump are made as a set. Do not put the plunger of one pump
in the barrel of another pump. If one part has wear, install a complete
new pump assembly. Be careful when the plunger is put into the bore
of the barrel.
NOTE: Do not remove the gear from the plunger. The gear and plunger are assembled and adjusted
at the factory.
1. Pull plunger (4) and washer (3) out of barrel (1) and spring (2).
2. Remove spring (2) from barrel (1).
3. Use the following procedure to put the fuel pump in position on Tool (A):
a. Select the correct turret position.
b. Place a barrel assembly into the turret.
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c. Loosen the nut on the clamp.
d. Adjust clamp end (6) until the bonnet is almost touching the barrel when the clamp handle is in
the locked position.
e. Tighten the nut on the clamp.
4. Use Tool (B) to expand ring (5), and carefully lift it off the fuel pump.
5. Slowly release the clamp handle of Tool (A), and remove the lockring.
6. Remove bonnet (7), spring (8) and valve (9) from barrel (1).
NOTE: The following steps are for assembly of the fuel injection pumps.
NOTICE
Put clean fuel on all parts during assembly.
7. Put spring (8) and valve (9) in bonnet (7).
8. Put bonnet (7) barrel (1) and ring (5) in position on Tool (A).
9. Put the barrel assembly in position on Tool (A). Lower the handle on Tool group (A) to hold the
fuel pump together.
10. Use Tool (B), and lower ring (5) on to the barrel and the bonnet to hold them together.
11. Remove the barrel assembly from Tool (B).
12. Install spring (2) on barrel (1).
13. Install washer (3) on plunger (4). Make sure the spring seat on the washer is away from the gear
on the plunger.
14. Install plunger (4) in barrel (1). Make sure spring (2) is engaged in the spring seat on washer (3).
End By:
a. install fuel injection pumps
Copyright 1993 - 2021 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Apr 3 07:12:47 UTC+0800 2021
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Shutdown SIS
Previous Screen
SENR64090010
Fuel Injection Pump Housing
SMCS - 1253-015; 1253-016
Disassemble Fuel Injection Pump Housing
Start By:
a. disassemble governor
b. remove fuel injection pumps
1. Remove the six lifters from the fuel pump housing.
2. Remove rack (1) and camshaft (2) from the fuel pump housing. If necessary, use a soft hammer
to push the camshaft out the governor end.
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3. Use Tool (A) and remove the three camshaft bearings from the fuel pump housing.
4. Remove rack bearing (4) and the other rack bearing from the fuel pump housing.
5. Remove dowel (3) from the fuel pump housing.
6. Remove bolts (6), cover (5) and the gasket from the fuel pump housing.
Assemble Fuel Injection Pump Housing
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1. Install gasket (7) and cover (5) on the side of the fuel pump housing.
2. Use Tool (B) and install the D shaped rack bearing into the governor and fuel pump drive side
of the fuel pump housing 87.0 ± 0.5 mm (3.42 ± .02 in) from outside surface (X).
3. The inside flat diameter after assembly must be 11.178 ± 0.050 mm (.440 ± .002 in) and the
inside large diameter must be 12.767 ± 0.058 mm (.503 ± .002 in).
4. Install dowel (3) in the fuel pump housing 6.0 ± 0.5 (.24 ± .02 in) above the outside surface.
5. Use Tool (C) and install the rack bearing into the fuel pump housing 7.16 ± 0.13 mm (.282
± .005 in) below the surface of the pump housing.
6. The inside diameter of the bearing after assembly must be 12.746 ± 0.045 (.502 ± .002 in).
7. Use Tool (A) and install the three camshaft bearings in the fuel pump housing with the oil holes
in the bearings 30 ± 3 degrees from the horizontal center line toward the plugged holes in the fuel
pump housing.
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8. The inside diameter of all three bearings after assembly must be 68.399 ± 0.038 mm (2.6905
± .0015 in).
9. Make sure bearing (8) on the governor and fuel pump drive is installed 1.0 ± 0.5 mm (.04 ± .02
in) below surface (Y).
10. Make sure middle bearing (9) is 218 ± 0.3 mm (8.6 ± .01 in) below surface (Y).
11. Make sure bearing (10) governor side is 1.00 ± 0.25 mm (.040 ± .010 in) below the outside
surface.
12. Remove the plugs from the side of the fuel pump housing. The oil holes in the bearings must
in alignment with holes (11) in the fuel pump housing. If the bearings are not in alignment,
remove them and install again.
13. Make an alignment of rack (1) and install it in the fuel pump housing.
14. Install the six lifters in the fuel pump housing. Make sure the pins in the lifter are on the same
side as the dowels in the fuel pump housing.
End By:
a. install fuel injection pumps
b. assemble governor
Sat Apr 3 07:13:43 UTC+0800 2021
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Shutdown SIS
Previous Screen
SENR64090011
Fuel Ratio Control
SMCS - 1278-010; 1278-017
Remove & Install Fuel Ration Control
1. Disconnect air line (1) from the fuel ratio control.
2. Remove wire seal (4) from the bolts.
3. Remove bolts (3) that hold fuel ratio control (2).
4. Remove the fuel ratio control by pulling down and out from the collar.
NOTE: The following steps are for the installation of the fuel ratio control.
5. Put fuel ratio control (2) in position on the governor. Make sure the valve head of the fuel ratio
control is connected in the groove of the collar.
6. Install bolts (3) that hold the fuel ratio control to the governor. Connect air line (1) to the fuel ratio
control.
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7. To make an adjustment to the fuel ratio control, see the topic "Governor Adjustment For The Air
Fuel Ratio Control" in, Testing & Adjusting Manual SENR6471.
8. Install wire seal (4) on the bolts with Tool (A).
Disassemble & Assemble Fuel Ratio Control
Start By:
a. remove fuel ratio control
1. Put Tool (A) in a vise so that the station being used is not over the vise jaw. Place the fuel ratio
control over the pins in Tool (A). Remove bolts (3) and remove cover (26) and gasket (24).
NOTICE
There is spring force behind cover (7). Hold cover (7) in position, and
slowly remove the bolts that hold it to release the spring force.
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2. Remove bolts (6). Remove cover (7) from housing (10).
3. Remove nut (5) and stop (4) from cover (7).
4. Remove spring (8), washer (9) and diaphragm (21) from retainer (25). Remove retainer (25) from
housing (10).
5. Remove tube (1) from the end of extension (19). Remove nut (2) from extension (19) and remove
the extension from retainer (25). Remove valve (16), spring (22) and O-ring seal (23) from the
extension.
6. Remove spring (20), retainer (18) and spring (17) from housing (10).
7. Remove piston (12) and valve assembly (14) from the housing.
8. Use Tool (B) and remove snap ring (13) and washer (15) from the valve assembly. Remove piston
(12) from the valve assembly.
9. Remove seal (11) from piston (12).
10. If necessary, remove the stem portion from valve assembly (14).
11. Clean and inspect all parts. Make a replacement of all parts that are worn and damaged.
NOTE: The following steps are for the assembly of the fuel ratio control.
12. If removed during disassembly, assemble the stem portion of valve assembly (14) on the valve
using 9S3265 Retaining Compound.
13. Lubricate seal (11) lightly with the lubricant being sealed. Put seal (11) on piston (12) and put
piston (12) on valve assembly (14).
14. Put washer (15) in position on the valve assembly and use Tool (B) to install snap ring (13) on
the valve assembly.
15. Place housing (10) on Tool (A), and put Tool (C) into the bore of the housing. Lubricate Tool
(C) with clean engine oil.
16. Push piston (12) into position with a smooth swift motion. Remove Tool (C) from the housing.
Place spring (17), retainer (18) and spring (20) in housing (10).
17. Put O-ring seal (23) on extension (19). Put spring (22) and valve (16) in position on the
extension.
18. Lubricate the bore of retainer (25) and O-ring seal (23) with clean engine oil. Install extension
(19) in retainer (25). Install nut (2) on extension (19).
19. Place tube (1) on the end of extension (19). Heat the tube to a temperature of 149°C (300°F) or
until the tube shrinks.
20. Put diaphragm (21), washer (9) and spring (8) in position on retainer (25). Install retainer (25) in
housing (10).
21. Install stop (4) and nut (5) in cover (7). Hold retainer (25) in position and install cover (7) on
housing (10). Install bolts (6) that hold the cover and tighten them to a torque of 9 ± 3 N·m (7 ± 2 lb
ft).
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22. Make a replacement of gasket (24) and install the gasket and cover (26) with bolts (3).
End By:
a. install fuel ratio control
Sat Apr 3 07:14:39 UTC+0800 2021
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Shutdown SIS
Previous Screen
SENR64090012
Fuel Injection Lines
SMCS - 1252-010
Remove & Install Fuel Injection Lines
If fuel line clamps are not installed in their exact location, vibration can
cause the fuel lines to break and cause possible personal injury, or
damage to the machine.
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1. Disconnect front fuel injection lines (1), disconnect middle fuel injection lines (2) and rear fuel
injection lines (3) from the fuel injection pump and the cylinder head assembly.
2. Remove fuel injection lines (1), (2) and (3). Put caps or plugs on all fuel line connections to
keep foreign material out of the fuel system.
3. If a separation of the fuel lines has to be made, make sure the exact location of the clamps are
marked for assembly purposes. Remove the clamps and make a separation of the fuel lines.
NOTE: The following steps are for the installation of the fuel injection lines.
4. Remove the caps or plugs for the fuel injection line connections.
5. If removed, connect the fuel lines with the clamps. Make sure the clamps are installed back in
their correct location. Use Tool (A) to tighten the clamp bolts to a torque of 2.3 N·m (20 lb in).
For more information, see Specifications Manual SENR6470, of Testing & Adjusting Manual
SENR6471.
6. Install front fuel injection lines (1) on the fuel injection pump and cylinder head assembly.
7 Install middle fuel injection lines (2) on the fuel injection pump and the cylinder head assembly.
8. Install rear fuel injection lines (3) on the fuel injection pump and the cylinder head assembly.
9. Tighten the fuel injection line nuts to a torque of 40 ± 7 N·m (30 ± 5 lb ft).
Sat Apr 3 07:15:35 UTC+0800 2021
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Shutdown SIS
Previous Screen
SENR64090013
Fuel Transfer Pump
SMCS - 1256-010; 1256-017
Remove & Install Fuel Transfer Pump
1. Disconnect fuel line (3) from the fuel transfer pump. Cap or plug immediately.
2. Disconnect fuel line (4) from the fuel transfer pump. Cap or plug immediately.
3. Remove bolts (1).
4. Remove fuel transfer pump (2). Check the condition of the O-ring seal on the fuel transfer
pump. If necessary, make a replacement. Put clean engine oil on the O-ring seal when assembling
fuel transfer pump.
NOTE: For installation of the fuel transfer pump, reverse the removal steps.
Disassemble & Assemble Fuel Transfer Pump
Start By:
a. remove fuel transfer pump
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1. Remove seal (1) from the fuel transfer pump.
Cover (2) is under spring tension. Remove the bolts that hold cover (2)
slowly to prevent injury.
2. Remove bolts (3) and cover (2) the housing.
3. Remove seals (4) and valve (5) from cover (2).
4. Remove spring (6) from the piston.
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NOTICE
Mark the orientation of valve (8) as to its location in the housing.
5. Remove washer (7) and valve (8) from the housing.
6. Remove piston (9) and sleeve (10) from the housing.
7. Remove seal (11) from sleeve (12).
8. Remove guide and tappet assembly (13) from the housing.
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9. Remove seal (14) from guide (15).
NOTICE
If tappet (17) or guide (15) are damaged or worn, they must be
replaced as a unit.
10. Remove ring (16) from tappet (17) and the tappet from guide (15).
11. Remove the bolts and cover (18) from the housing.
12. Remove seal (19) from cover (18).
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13. Remove valve (20) from the housing.
NOTE: The following steps are for the assembly of the fuel transfer pump.
14. Install valve (20) in the housing. Put clean fuel on seal (19) and install it on cover (18). Install
the cover on the housing.
15. Install tappet (17) in guide (15). Install ring (16) on tappet (17) to hold the tappet in the guide.
16. Put clean fuel on seal (14) and install it on the guide and tappet assembly (13). Install guide
and tappet assembly (13) in the housing.
17. Put clean fuel on seal (11) and install it on sleeve (12). Install sleeve (12) in the housing.
18. Install piston (9) in the housing. Install valve (8) and washer (7) in the housing. Install spring
(6) in the piston.
19. Install valve (5) in cover (2).
20. Put clean fuel on seals (4) and put them in position on cover (2). Install cover (2) on the
housing.
21. Put seal (1) in position on the fuel transfer pump.
End By:
a. install fuel transfer pump
Sat Apr 3 07:16:30 UTC+0800 2021
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Shutdown SIS
Previous Screen
SENR64090014
Oil Filter & Base Assembly
SMCS - 1306-010; 1306-017; 1318
Remove & Install Oil Filter & Base Assembly
1. Use Tool (A) to remove oil filter (3) from oil filter base assembly (2). Upon installation, follow
the instructions on the oil filter for the correct installation procedure.
2. Remove four bolts (1).
3. Remove oil filter base assembly (2).
4. Check the gasket between the oil filter base and the adapter for wear or damage. Replace with a
new part if necessary.
NOTE: For installation of the oil filter & base, reverse the removal steps.
5. Check the engine oil level. See the Operation & Maintenance Manual.
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Disassemble & Assemble Oil Filter Base
Start By:
a. remove oil filter base
1. Remove bolts (1) and cover (2) from oil filter base.
2. Remove spring (3) and valve (4) from oil filter base.
3. Remove bolts (5) and cover (6).
4. Remove gasket (7) and replace if necessary.
NOTE: For assembly of the oil filter base, reverse the disassembly steps.
End By:
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a. install oil filter base
Sat Apr 3 07:17:26 UTC+0800 2021
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Shutdown SIS
Previous Screen
SENR64090015
Shutoff Solenoid
SMCS - 1259-010
Remove & Install Shutoff Solenoid
1. Disconnect wires (3) to shutoff solenoid (4). (Previously disconnected).
2. Remove two bolts (1) and spacers (2).
3. Remove shutoff solenoid (4).
NOTE: For installation of the shutoff solenoid, reverse the removal steps.
Sat Apr 3 07:18:22 UTC+0800 2021
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Suggest:
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Please download this document
first, and then click the above link
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Shutdown SIS
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SENR64090016
Exhaust Manifold
SMCS - 1059-010
Remove & Install Exhaust Manifold
Start By:
a. remove turbocharger
Typical Example
1. Loosen hose clamp (1). Remove bolt (2) that holds the pipe to the engine block.
2. Turn breather tube (3) away from the exhaust manifold.
Typical Example
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Caterpillar Cat 621E WHEEL TRACTOR (Prefix 2PD) Service Repair Manual Instant Download.pdf

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