Caterpillar cat 307 b mini hydraulic excavator (prefix afb) service repair manual (afb00001 and up)

Service Repair Manual
Models
307B Mini Hydraulic
Excavator

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Product: MINI HYD EXCAVATOR
Model: 307B MINI HYD EXCAVATOR AFB
Configuration: 307B Excavator AFB00001-UP (MACHINE) POWERED BY 4M40 Engine
Disassembly and Assembly
307B Excavator Machine Systems
Media Number -RENR1091-03 Publication Date -01/09/2000 Date Updated -23/07/2018
i01991694
Track - Separate
SMCS - 4170-076
Separation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 5P-6214 Track Block Assembly 1
B 1U-7627 Socket 1
Start By:
a. Put the machine on a flat, level surface.
Personal injury or death can result from grease and oil coming out of
the relief valve.
Grease and oil are under high pressure coming out of the relief valve
and can penetrate the body.
Do not watch the relief valve to see if grease is escaping. Watch the track
or track adjustment cylinder to see if the track is being loosened.
Make sure the vent holes are clean before the tension is released on the
track.
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Personal injury can result from the track coming off of the roller frame.
The track can move off the track roller frame very quickly when a
separation of the track is made.
Keep away from the front of the machine when the track is removed
from the track roller frame.
1. Position the master pin in a horizontal line through the center of the drive sprocket.
2. Release the tension on the track assembly. Refer to Operation and Maintenance Manual,
"Track Adjustment - Adjust" for the proper procedure.
Illustration 1 g01031560
3. Use Tooling (B) to remove bolts (1). Remove track shoes (2).
4. Move the track assembly until master pin (3) is in the approximate position, as shown.
Position Tooling (A) under the track grouser, as shown. Move the track onto the tool.

Note: The two track bushings may fall out of the track links when the track assembly is
separated.
5. Remove cotter pin (4) from the master pin. Use a hammer and a punch to remove master pin
(3) from the track links. Separate the track links, and locate the two track bushings. Slowly,
move the machine forward in order to move the track assembly off the sprocket, the track
carrier roller, and the front idler.
6. Attach a suitable lifting device to the track assembly. Raise the track assembly off Tooling
(A). Remove Tooling (A) from the track assembly and lower the track assembly to the floor.
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Sat Jan 25 22:42:54 UTC+0800 2020

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i01991695
Track - Connect
SMCS - 4170-077
Connection Procedure
Table 1
Required Tools
A 5P-6214 Track Block Assembly 1
B 1U-7627 Socket 2
C 1P-3545 Chain Coupling Tool 1
D 1P-3533 Carrier Bar 1
E 5P-0960 Molybdenum Grease
Start By:
a. Thoroughly clean the track assembly, the sprocket, and the track rollers prior to connecting
the track assembly.

1. Install Tooling (C) in the track link and on the sprocket, as shown.
2. Slowly move the sprocket forward until the track assembly is pulled up on the sprocket.
Move the sprocket forward until the end of the track assembly is past a vertical line through
the center of the sprocket. Remove Tooling (C).
3. Install Tooling (D) between the first bushing in the track link and the sprocket, as shown.
4. Move the sprocket forward. Use Tooling (D) to guide the track assembly over the carrier
roller and the front idler.

5. Slowly move the machine forward until the separation in the track assembly is below a
horizontal line through the center of the front idler.
6. Put Tooling (E) on bushings (6) in order to hold the bushings in place. Install bushings (6)
in the track links.
7. Raise the front of the track assembly, and install Tooling (A) under the track assembly.
Slowly move the machine forward until the separation in the track assembly closes, and the
pin bores in each end of the track assembly are in alignment with each other. The machine
may need to be moved back and forth in order to align the pin bores.
8. Put Tooling (E) in the master pin bores in the track assembly and on master pin (3). Install
master pin (3) with a hammer and a punch. Install cotter pin (4) in order to retain the master
pin. Remove Tooling (A).
9. Install two track shoes (2) over the master pin on the track assembly. Use Tooling (B) to
tighten eight bolts (1) that hold the two track shoes in place.
10. Adjust the track tension. Refer to Operation and Maintenance Manual, "Track Adjustment -
Adjust" for the correct procedure.

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i01709068
Front Idler and Recoil Spring - Remove
SMCS - 4158-011; 4159-011
Removal Procedure
Start By:
a. Separate track assemblies. Refer to Disassembly and Assembly, "Track - Separate".

1. Pull the front idler and recoil spring assembly (1) partially out of the undercarriage frame.
Attach a suitable lifting device to the front idler. Pull the front idler and recoil spring
assembly out of the undercarriage frame until the recoil spring is exposed.
2. Reposition the lifting device to the front idler and the recoil spring assembly. Remove the
front idler and recoil spring assembly (1) from the undercarriage frame. The weight of the
unit is approximately 81 kg (179 lb).
3. Position the front idler and recoil spring assembly horizontally. Block the unit in position in
order to keep the unit from falling. Attach a suitable lifting device to recoil spring (2).
Remove four bolts (3) and separate recoil spring (2) from front idler (4). The weight of the
recoil spring is approximately 27 kg (60 lb). The weight of the front idler is approximately
54 kg (120 lb).
Sat Jan 25 22:44:48 UTC+0800 2020

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i01061933
Front Idler - Disassemble
SMCS - 4159-015
Disassembly Procedure
Table 1
Required Tools
(A) 1P-2321 Puller Assembly 1
Start By:
a. Remove the front idler and recoil spring assembly. Refer to Disassembly and Assembly,
"Front Idler and Recoil Spring - Install" in this manual.
1. Thoroughly clean the outside of the front idler prior to disassembly. The weight of the front
idler is 54 kg (120 lb).
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.

2. Remove fill/drain plug (2) from the front idler. Drain the oil from the idler into a suitable
container for disposal. The capacity of the front idler is 60 ± 5 mL (2.04 ± 0.17 oz).
3. Use a hammer and a punch to remove spring pin (1) from idler bearing (3). Remove idler
bearing (3) from the shaft of the front idler. If necessary, use Tool (A) to remove bearing
(3).
4. Repeat step 3 and remove the other idler bearing from the shaft of the front idler.
Note: Refer to Disassembly and Assembly , "Duo-Cone Conventional Seals - Remove"in
this manual for more information.
5. Remove Duo-cone seal kit (4) from each idler bearing (3).

6. Remove O-ring seal (5) from shaft (6). Remove shaft (6) from the front idler.
7. Remove remaining O-ring seal (5) from shaft (6).
8. Remove Duo-cone seal kit (4) from each side of the front idler.
9. Remove bushing (7) from each side of the front idler.

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i01062235
Front Idler - Assemble
SMCS - 4159-016
Assembly Procedure
Table 1
Required Tools
(A) 123-3801 Installer Assembly 1
1. Thoroughly clean all parts of the front idler prior to assembly.
2. Check the condition of bushings (7). If the bushings are worn or damaged, use new parts for
replacement.
3. Lower the temperature of bushings (7), and install one in each side of the front idler with a
press.

4. Temporarily install an idler bearing (3) on shaft (6). Install the shaft in the front idler. Install
the other idler bearing (3) on the shaft. Check the end play of the shaft. The shaft end play
must be 0.1 mm (0.004 inch) to 1.2 mm (0.047 inch). Remove two idler bearings (3) and
shaft (6) from the front idler.
Note: Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Remove and
Install" in this manual for more information.
5. Install a Duo-Cone seal (4) in each side of the front idler with Tool (A).
6. Install a Duo-Cone seal (4) in each idler bearing (3) with Tool (A).

7. Check the condition of O-ring seals (5) that are used on shaft (6). If the seals are damaged,
use new parts for replacement. Install two O-ring seals (5) on shaft (6). Put clean SAE 30 oil
on the seals.
8. Check the condition of spring pins (1) that are used to hold idler bearings (3) to shaft (6). If
the spring pins are damaged, use new parts for replacement.
(B) 20 degrees
(C) 40 degrees

9. Install shaft (6) in either idler bearing (3). Be sure to align the spring pin hole in the shaft
with the spring pin hole in the idler bearing. Be sure that marking "R" and the milled surface
of the shaft is facing toward the rear of the idler bearing, as shown. Install a new spring pin
(1) in the idler bearing and through the shaft. Install the spring pin with the slit, as shown.
10. Install the assembled bearing with the shaft into the front idler.
11. Install the other idler bearing (3) on shaft (6). Be sure to align the spring pin hole in the
shaft with the spring pin hole in the idler bearing. Install a new spring pin (1) in the idler
bearing and through the shaft. Install the spring pin with the slit, as shown.
12. Check the front idler for air leaks. Apply 245 to 265 kPa (35.5 to 38.5 psi) of air to the idler
for a minimum of 30 seconds . Monitor the pressure gauge reading for 30 seconds. No drop
in pressure over 30 seconds indicates that there are no significant leaks in the front idler.
13. Put the front idler in a vertical position. Fill the front idler with 60 ± 5 mL (2.04 ± 0.17 oz)
of clean SAE 30 oil. Reinstall the fill/drain plug in the front idler.
End By:
a. Install front idlers and recoil springs. Refer to Disassembly and Assembly, "Front Idlers and
Recoil Springs - Install" in this manual.
Sat Jan 25 22:46:41 UTC+0800 2020

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i04294417
Recoil Spring - Disassemble
SMCS - 4158-015
Disassembly Procedure
Table 1
Required Tools
A 4C-9540 Recoil Spring Bench 1
(B)
146-2457 Hydraulic Power Supply Gp 1
223-3506 Hydraulic Cylinder and Lines Gp 1
C
8F-0024 Hose Assembly 2
3B-7722 Bushing 2
1P-2376 Coupler Assembly 2
1P-2377 Plug 1
D 8S-9971 Adapter for Ram 1
Start By:
a. Remove front idlers and recoil springs. Refer to Disassembly and Assembly, "Front Idler
and Recoil Spring - Remove".
Note: Adjust the pump relief valve. To avoid damage or injury, the pressure should not
exceed 51366 kPa (7450 psi).

Sudden release of spring force can cause injury.
To prevent the possibility of injury, follow the procedure to relieve the
spring pressure.
1. Thoroughly clean the outside of the recoil spring assembly.
2. Install Tooling (D) on Tooling (B), as shown.
(1) Adjustable support

Tooling (A)
( 2) Reaction plate
(3) Movable plate
3. Determine the position for the recoil spring assembly in Tooling (A). Locate adjustable
support (1) of Tooling (A) in this position. Level the adjustable support.
4. Measure the length of the recoil spring assembly. Adjust the space from reaction plate (2) to
movable plate (3) in order to fit the measured length.
5. Remove bolt (5) and lock plate (4) from the end of the retaining rod for the recoil spring
assembly.

6. Attach a suitable lifting device to recoil spring assembly (6). The weight of the recoil spring
assembly is approximately 24 kg (53 lb). Position the recoil spring assembly on adjustable
support (1) in Tooling (A). Align the centerline of the recoil spring assembly with the
centerline of Tooling (A) by moving the adjustable support.
7. Use the following procedure to position the recoil spring assembly in Tooling (A).
a. Level the recoil spring assembly by repositioning the adjustable support.
b. Position the recoil spring assembly so that nut (8) is centered in the hole of reaction
plate (2).
c. Install two pins (7) on the back side of reaction plate (2), as shown.
d. Operate Tooling (B) enough to hold the recoil spring assembly in position between
reaction plate (2) and movable plate (3).
e. Be sure that the recoil spring assembly is leveled and centered in Tooling (A).
8. Close covers (9) on Tooling (A). Operate Tooling (B) and slowly compress the recoil spring
assembly until the retaining rod and the nut are free to move.

Caterpillar cat 307 b mini hydraulic excavator (prefix afb) service repair manual (afb00001 and up)

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