Caterpillar Cat 303ECR Mini Hydraulic Excavator (Prefix FR3) Service Repair Manual (FR300001 and up).pdf

Service Repair Manual
Models
303E CR Mini
Hydraulic Excavator

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Product: MINI HYD EXCAVATOR
Model: 303ECR MINI HYD EXCAVATOR FR3
Configuration: 303ECR Mini Hydraulic Excavator FR300001-UP (MACHINE) POWERED BY C1.3 Engine
Disassembly and Assembly
C1.3 Engine for Caterpillar Built Machines
Media Number -UENR3292-03 Publication Date -01/05/2014 Date Updated -02/02/2017
i05350789
Fuel Injection Lines - Remove and Install
SMCS - 1252-010
Removal 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.
Dispose of all fluids according to local regulations and mandates.
Illustration 1 g03367036
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303ECR Mini Hydraulic Excavator FR300001-UP (MACHINE) POWERED BY C1.3...
2020/2/23
https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

1. Loosen fuel injection line nuts (1) that hold fuel injection lines (2) to the injectors.
Note: Use two wrenches to loosen fuel injector nuts (3). Hold nut (4) on fuel injector pump
stationary.
Note: If the fuel injection pump nut (4) turns, a leak can occur. In order to repair the
leak, the pump will need to be sent to an authorized pump service shop.
1. Loosen fuel injection line nuts (3). Remove fuel injection lines (2).
Installation Procedure
1. Install fuel injection lines (2) in the reverse order of removal.
a. Tighten fuel injection line nut (1) and (3) to a torque of 25 to 34 N·m
(221 to 300 lb in).
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sun Feb 23 10:10:29 UTC+0800 2020
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i05317149
Governor - Remove
SMCS - 1264-011
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1859 Retaining Ring Pliers 1
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
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1. Before removing the governor assembly, align the timing marks on all gears on the front of
the engine.
1. Remove bolts (1) and speed control plate (2). Remove stop solenoid (2A).
2. Disconnect governor spring (3) from speed control plate (2). Remove governor spring (3).
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3. Remove start spring (4) from thrust lever (5).
4. Remove bolts (6) and injector pump (7). Align the control rack pin (7A) with the notch in
the crankcase (7B).
5. Remove plug (8).
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6. Measure the height of max torque limiter (8) from block and record for installation
purposes. Remove max torque limiter (8).
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7. Remove plate (10). Use bolt (1) in order to pull shaft (12) and bearing collar (11) from the
governor housing.
8. Remove fork lever assembly (13) from the governor housing.
9. Remove fuel camshaft stopper (14) and fuel camshaft gear assembly (15).
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10. Remove plug (16). Using Tooling (A) remove retaining ring (17). Remove governor shaft
and gear assembly (18).
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11. Remove setscrew (19) and bearing (20). Remove bearing (21).
Sun Feb 23 10:11:26 UTC+0800 2020
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i05318443
Governor - Install
SMCS - 1264-012
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1859 Retaining Ring Pliers 1
B 442-0744 Bushing Tool 1
C - Loctite 593 Silicone Sealer
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
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1. Install bearing (20). Apply Tooling (C) to set screw (19). Install set screw (19) until the
tapered part contacts the bearing (20) as shown. Using Tooling (B), install bearing (21).
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2. Install governor shaft and gear assembly (18). Install retaining ring (17) on shaft. Install
plug (16).
3. Install fuel camshaft gear assembly (15). Make sure to line up timing marks on gears upon
installation. Install fuel camshaft stopper (14).
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4. Install fork lever assembly (13) into the governor housing.
5. Use bolt (1) in order to install shaft (12) into the governor housing and fork lever assembly
(13). Install bearing collar (11). Install plate (10).
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6. Install max torque limiter (9) to the Pre measured height recorded from disassembly.
7. Apply Tooling (C) on plug (8). Install plug (8).
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Note: Addition or reduction of shims 0.05 mm (0.002 inch) delays or advances the
injection timing by approximately 0.0087 rad (0.5). In disassembling and replacing, be
sure to use the same thickness of new shims that are being replaced.
8. Place new shims (7) to the amount of thickness recorded from the removal procedure. When
installing injection pump (6) insert the rack pin into the groove (6) of the thrust lever on the
fork. Install injector pump (5). Install the bolts.
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9. Install start spring (4) onto the thrust lever.
10. Install governor spring (3). Connect governor spring (3) to speed control plate (2).
11. Place Tooling (C) onto the mounting surface of speed control plate (2). Install speed control
plate (2). Install bolts (1). Place Tooling (C) on stop solenoid (2A). Install stop solenoid
(2A).
Sun Feb 23 10:12:22 UTC+0800 2020
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i05319637
Fuel Injection Pump - Remove and Install
SMCS - 1251-010
Removal Procedure
Start By:
a. Remove fuel injection lines.
1. Remove solenoid (1). Remove bolts (2) and speed control plate (3).
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2. Remove start spring (4).
3. Remove bolts (5) and fuel injection pump (6).
4. When removing the injection pump, align the control rack pin with the notch.
5. Remove shims (7) from under fuel injection pump (6). Record the number and thickness of
shims (7) for installation purposes.
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Installation Procedure
1. Place new shims (7) to the amount of thickness recorded from the removal procedure. When
installing injection pump (6) align the control rack pin with the notch. Insert the rack pin
into groove (8) of the thrust lever on the fork.
Note: Addition or reduction of shims 0.05 mm (0.002 inch) delays or advances the
injection timing by approximately 0.0087 rad (0.5). In disassembling and replacing, be
sure to use the same thickness of new shims that are being replaced.
2. Install fuel injection pump (6). Install bolts (5).
3/4
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Caterpillar Cat 303ECR Mini Hydraulic Excavator (Prefix FR3) Service Repair Manual (FR300001 and up).pdf

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