Kubota U48-4, U55-4 Excavator Workshop Service Manual

Kubota Excavator Model U48-4, U55-4
Publication: RY921-20530
Format: PDF
Language: English
Kubota U48-4, U55-4 Excavator Workshop Manual – 799 Pages

Table of Content of the Workshop Service Manual

I General
II Machine body
• Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .II-M-1
• Service Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .II-S-1
III Engine
• Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .III-M-1
• Service Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .III-S-1
IV Hydraulic System
• Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IV-M-1
• Service Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IV-S-1
V. ELECTRICAL SYSTEM
• Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-M-1
• Service Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-S-1

U48-4, U55-4
Your KUBOTA dealer is always ready to help so that your excavator offers the best performance. After having carefully read this manual, you will realize that much of the routine maintenance can be done by yourself. Machines must be disassembled and assembled efficiently and safely. It is very important to thoroughly understand the construction and function of the machine, to make all appropriate preparations, and start operations according to the specified working procedures in this workshop service manual.

IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING

a Operate the Kubota U48-4, U55-4 Excavator and check for Unusual Noise and Vibrations.
b Make Sure the Safety decals and Wire harness Clamps are in their Specified Positions.
c With the Machine Front in a Specified Posture, Check the Amount of Hydrauric Oil Checking the oil level (For further details, refer to the Excavator U48-4, U55-4 Operators Manual)
1) Park the machine on a level ground.
2) Make sure the hydraulic oil temperature is in the range of 10-30C (50-86F) and see if the oil level is within the specified zone of the oil level gauge.
3) Keep the machine front as shown as following posture.

This Kubota Excavator Workshop Manual provides service personnel with information about the mechanisms, service
and maintenance of the construction machinery. This Workshop Manual is divided into 3 sections,
General, Mechanisms and Service.
General
This section contains information of the Kubota U48-4, U55-4 Excavator such as engine and equipment ID numbers, general precautions,
maintenance schedules, inspections and maintenance items and special tools.
Mechanisms
This section describes the structure of mechanisms and explains their functions.Be sure that you
fully understand this Mechanisms section prior to performing any service work, such as troubleshooting
or when performing any disassembly or assembly work.
Service
This section contains information and procedures for performing maintenance on the backhoe, such
as troubleshooting, service specification tables, torque specifications, items to be inspected and
adjusted, disassembly and assembly procedures, as well as precautions, maintenance standard values
and usage limits.
All of the illustrations, specifications and other information in this manual were created based on the
latest model of the Kubota U48-4, U55-4 Excavator at the time of publication.