Kubota U20-3, U25-3 Excavator Workshop Manual

Kubota Excavator Model U20-3, U25-3
Publication: 97899-61970
Format: PDF
Language: English
Kubota U20-3, U25-3 Excavator Workshop Manual – 740 Pages

Table of Content of the Workshop Service Manual

I. General
A. Body and engine identification marks…………………………………………………………………………………. I-2
B. Safety precautions for servicing, disassembly and reassembly………………………………………….. I-3
a. Safety measures before starting work …………………………………………………………………… I-3
b. Safety measures during work ………………………………………………………………………………. I-3
c. Preparation for disassembly ………………………………………………………………………………… I-4
d. Precautions for disassembly and reassembly…………………………………………………………. I-4
C. IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS……………….. I-5
a. Essential Adhesives……………………………………………………………………………………………. I-5
b. Important Safety Process ……………………………………………………………………………….. I-5
c. Important Critical Functional Process ……………………………………………………………….. I-5
D. IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING………………………………………….. I-5
E. SERVICING FUNDAMENTALS …………………………………………………………………………………I-6
a. Items for Servicing ……………………………………………………………………………………………… I-6
b. O-ring, Oil seal, Circlip and Roll Pin………………………………………………………………………. I-8
c. Piping ……………………………………………………………………………………………………………… I-10
d. Machine Quality Specifications ……………………………………………………………………………………. I-15
F. Maintenance intervals ……………………………………………………………………………………………. I-23
a. Maintenance intervals chart ……………………………………………………………………………….. I-23
b. Hydraulic Oil Check for machines with Hydraulic Breakers …………………………………….. I-24
c. Periodic replacement of important parts ………………………………………………………………. I-25

U20-3, U25-3
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 U20-3, U25-3 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 U20-3, U25-3 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.

To ensure safety in traveling and operating the Kubota U20-3, U25-3 Excavator, the user is strongly requested to carry out periodic inspection and servicing. For added safety, the following important parts, related to safety and fire hazards in particular, must be replaced at their specified intervals.

With the passage of time, these parts easily get degraded in material or worn out. They are difficult to check for anything unusual even at periodic inspection and servicing. Even if nothing unusual is found, it is essential to replace them with new ones after their specified service life, in order to maintain complete function.

If by any chance any of these parts of the Kubota Excavator gets in trouble even before its service life, it must be repaired or replaced as usual.

In replacing the hoses, check also the hose clamps for deformation, cracks and other troubles. Replace the hose clamps too with new ones, as required.
Check all the hydraulic hoses, including those to be replaced at regular intervals, for the following points.
Tighten up or replace them, as required.
When replacing the hydraulic hoses, change their O-rings and sealing for new ones at the same time.