Kubota u15-3 Instruction manual

WORKSHOP MANUAL
KUBOTA EXCAVATOR
U15-3
Code No.97899-61270

Record of Revisions
Symbol Date Main Revised Points & Corrective Measures Person-in-charge
1
2
3
4

ss
IProduct engineering section
II Service engineering section
CONTENTS

WSM U15-3
I-1
IProduct engineering section
A.Developing concept and feature . . . . . . . . . . . . . . . . . . . . . .I-3
a. Objective and Concept of Development . . . . . . . . . . . . . . . . . . . . . . . I-3
b. Main Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-3
c. Major Selling Points and Improvements . . . . . . . . . . . . . . . . . . . . . . . I-4
d. Evaluation of Competitive Power with Competitors . . . . . . . . . . . . . . I-8
e. Actual performance comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-11
B.Machine specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .I-12
a. Major dimensions and working range (with rubber crawler) . . . . . . . I-12
b. Dimensional drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13
c. Performance and lifting capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-14

WSM U15-3
I-2

WSM U15-3
I-3
A.Developing concept and feature
a. Objective and Concept of Development
1 Objective of Development
Development of products which go ahead of competitive companies in terms of reduced manufacturing
costs while reinforcing the performance in horizontal operability, workability, durability, comfort and
safety.
2 Product Concept
Integration of the world's best actual performance of backhoe and the spirit of innovation.
b. Main Specifications
model U15-3 U-15
Engine
Brand KUBOTA KUBOTA
Type D782-EBH-4 D782-BH
Output PS/rpm 13/2300 12/2100
kW/rpm 9.6/2300 8.8/2100
Displacement cm3778 778
Machine weight kg 1600 1450
Excavating capacity Bucket kN (kgf) 15.2 (1550) 12.5
Arm kN (kgf) 8.8 (900) 8.5
Hydraulic pump
P1, P2
Relief pressure kg/cm2220 210
Pump discharge rate L/min 16.6 15.1
P3
Relief pressure kg/cm2190 210
Pump discharge rate L/min 10.4 9.5

WSM U15-3
I-4
c. Major Selling Points and Improvements
1. Quick chart
Theft-proof version (EU - option)
Inner package of hoses for all attachments
Max. excavation capacity
increased by 22%
Max. excavation depth
increased by 10%
4-port ROPS specification
Engine start control
Travel lock function
Standard equipped with SC valve
High-positioned boom cylinder
Flat steps

WSM U15-3
I-5
2. Wrist arm control lever
3. Enlarged foot space
330mm
U-15 (Previous model)
460mm
U15-3 (New model)
4. Upper positioned boom cylinder 5. Inner package of hoses for front attachment
s

WSM U15-3
I-6
6. Engine start control, Travel lock function
7. 4-post ROPS
The equipment is of European specifications.
Unloading lever : UP
Engine start :
Front attachment,
traveling :
Unloading lever : DOWN
Engine start :
Front attachment,
traveling :

WSM U15-3
I-7
8. Machine equipped with theft-proof device (Future EU option)
9. Side-opening type full-open hood
Paint color and equipment are of European specifications.
Starter key set
Antenna unit
U-15 (Previous model) U15-3 (New model)

WSM U15-3
I-8
d. Evaluation of Competitive Power with Competitors
1. Workability
2. Durability
Item U15-3 Current
U-15
KOMATSU
PC15MR
YANMAR
Vio15
SCM
301.5CR Appealing point in sales
Offence Defense
{Increase in engine output 9.6 8.8 11.2 8.5 11.3
We will appeal such a
point that the max. exca-
vation capacity and max.
excavation depth which
are the basic perfor-
mances of excavating
machine take a lead over
those of our existing
machines as well as
competitive companies'
machines.
{Max. excavation capacity
increased by 22% 15.2 12.5 14.2 13.7 14.4
{Max. excavation depth
increased by 10% 2310 2100 2155 2100 2170
{Max. vertical depth
increased by 11% 1900 1720 1870 1750 1720
{Max. excavation radius
increased by 5% 3900 3720 3900 3720 3800
{Travel 2-speed traction force
increased by 5% ----
{Travel 2-speed speed
increased by 8% 2.2/4.3 2.0/4.0 2.3/4.3 2.1/4.3 2.3/4.0
{Swiveling force increased by
12% ----
Item U15-3 Current
U-15
KOMATSU
PC15MR
YANMAR
Vio15
SCM
301.5CR Appealing point in sales
Offence Defense
{Boom cylinder Protection of
cylinder by high-positioning
{
xxxx
As the greatest differenti-
ation from competitive
companies' products, we
will appeal such a point
that loading work can be
performed without has-
sle. This is because the
machine can be brought
close to a 2-ton dump
truck without damage to
the boom cylinder during
loading work. Such job is
found often with
machines of this class.
We will also appeal such
a point that the machine
is equipped with the
inner package of hoses
for all attachments which
gives no damage to cyl-
inder.
{Protection by inner package
of hoses for all attachments
{
''xx
{Standard equipped with ten-
sion spring
{
x{{{
{
Double-grouser type iron
crawler <For domestic mar-
ket only>
{
x--{
{Introduction of high-back
and integrated seat
{
x{{{
{Prevention of water entry by
enclosed hydraulic oil tank
{
x---
{Equipped with starter auto-
matic release function
{
x---
{Boom cast steel members
{
x{xx
{High-tensile brass bush
{
x{--

WSM U15-3
I-9
3. Operability
4. Comfort
5. Maintainability
6. Safety
Item U15-3 Current
U-15
KOMATSU
PC15MR
YANMAR
Vio15
SCM
301.5CR Appealing point in sales
Offence Defense
{Horizontal operation
{
x{{{We will appeal the com-
fort and operability of
horizontal operation to
users of current U-15.
We will also appeal to
rental users that the
starter key can be used
also for higher-ranked
models.
{Starter key used also for
higher-ranked models
{
x---
{Equipped with auto-glow
indicator
{
x---
{Right and left pedaling for
swing
{
x{{{
Item U15-3 Current
U-15
KOMATSU
PC15MR
YANMAR
Vio15
SCM
301.5CR Appealing point in sales
Offence Defense
{Ample getting-on/off space
{
Front
operation '''
We will appeal the
ampleness of getting-on/
off space.
{Flat steps
{
x{{{
Item U15-3 Current
U-15
KOMATSU
PC15MR
YANMAR
Vio15
SCM
301.5CR Appealing point in sales
Offence Defense
{Theft-proof specification
{
x x x x We will appeal to rental
uses that the machine
can be equipped with a
new system theft-proof
device as well as the
improved operability of
SC valve and 4P multi-
valve.
{Standard equipped with SC
valve
{
' --
{Rotary joint O-ring
{
x---
{Side-opening full-open hood
{
xxxx
{Split-type dozer hose
{
{x{x
Item U15-3 Current
U-15
KOMATSU
PC15MR
YANMAR
Vio15
SCM
301.5CR Appealing point in sales
Offence Defense
{Travel lock function, Unlock
{
xxx{We will appeal such a
point that the machine
assures the Japan's top-
class safety.
{Engine start control
{
xxx{
{Compatible with ROPS
{
xxxx

WSM U15-3
I-10
7. Working Range
mm
8. Outline of Hydraulic System (Travel straight function)
Travel straight function is possible only together with boom operation.
U15-3 U-15 Difference
Max. excavation depth 2310 2100 +210
Max. vertical excavation depth 1900 1720 +180
Max. excavation radius 3900 3720 +180
Max. excavation height 3540 3740 -200
Max. dumping height 2440 2600 -160
Max. floor excavation radius 3840 3610 +230
1200 1270 -70
䌐䋱
䊑䊷䊛
⿛ⴕᏀ
䊋䉬䉾䊃
P1
Boom
Travel Left
Bucket
䌐䋲
⿛ⴕฝ
䉰䊷䊎䉴
䉝䊷䊛
P2
Travel Right
Service
Arm
䌐䋳
䉴䉟䊮䉫
䊄䊷䉱
ᣓ࿁
P3
Swing
Dozer
Swivel
21.6 MPa
16.6 L/min
21.6 MPa
16.6 L/min
18.6 MPa
10.4 L/min

WSM U15-3
I-11
e. Actual performance comparison
1. On-site Excavation Test
-Test Conditions-
1 m trench excavation, 45-deg. discharge of soil
Excavation work for 10 min., (5-min. rotation)
The equipment is of European specifications.
* Actual measurement
2. Comparison of Operating Speed
* Actual measurement
3. Comparison of Stability
* Actual measurement
U15-3 U-15 Increasin
g rate
PC15MR-1 Vio15-2 301.5CR
Volume of soil discharged per hour m3/h 31.4 25.0 +26% *24.3 *26.3 *25.9
Cycle time sec 8.3 9.8 +15%
Fuel consumption cc/10min 400 390
Volume of soil discharged per liter of fuel m3/L 13.1 10.7 +22%
U15-3 U-15 difference
1. Attachment operated 3 times sec 47.3 48.9 +3.4%
2. Boom
(Ground level to top)
UP sec 2.3 2.9 +26.1%
DOWN 2.5 2.4 -4.0%
3. Swiveling speed rpm 9.0 7.8 +13.3%
4. Combined operation sec 29.7 29.9 -0.20
U15-3 U-15
Tipping load
Dynamic Front *148 *148
Dynamic Side *138 *127
Static Front *194 *213
Static Side *181 *177

WSM U15-3
I-12
B. Machine specifications
a. Major dimensions and working range (with rubber crawler)
from operator’s manual
Unit U15-3 Remarks
1 Overall length (at transport) mm 3570
2 Overall height (at transport) mm 2250
3 Overall width mm 1240/990
4 Minimum road clearance mm 145
5 Dozer outer width x height mm 1240/990 x 261
6 Tumbler-to-tumbler distance mm 1230
7 Crawler center distance mm 1010/760
8 Crawler shoe width mm 230
9 Crawler height mm 360
10 Swivel structure rear end height mm 422
11 Overall crawler length mm 1587
12 Approach angle deg. 30.1
13 Maximum digging height mm 3540
14 Maximum digging radius mm 3900
15 Maximum digging depth mm 2310
16 Maximum dumping height mm 2440
17 Maximum vertical digging depth mm 1910
18 Minimum front turning radius mm 1430/1207 Front/swing
19 Minimum tail turning radius mm 620
20 Ground contact pressure kPa
(kgf/cm2)25 (0.25)
21 Swing angle left/right deg. 63/58
22 Bucket lift angle deg. 180
23 Maximum ground digging radius mm 3840
24 Minimum ground finishing radius mm 1320
25 Radius at maximum digging height mm 2015
26 Radius at maximum dumping height mm 2012
27 Maximum bucket bottom height with
arm vertical mm 1200 Arm vertical or fully crowded
28 Overall height with arm crowded and
minimum front swivel radius mm 1430

WSM U15-3
I-13
b. Dimensional drawings
410 485 990
1240 620 980 990 1240 3540 2440 2310 1910 1430 2250 2630 265 180 2750 825 3570 3840 3900
A B C D E F G H I J K L M N O P Q R S T
(mm)
from operator’s manual

WSM U15-3
I-14
c. Performance and lifting capacity
1. Performance
Digging performance, cycle time conditions:Dig 1m depth with Standard bucket and dump soil on the
ground after 45° swivel.
Unit U15-3 Remarks
Standard bucket capacity heaped m30.04 CECE
Maximum digging force, arm KN(kgf) 8.8 (900) Teeth bottom
Maximum digging force, bucket KN(kgf) 15.2 (1550) Teeth bottom
Cycle time sec/cycle 10.8
Digging performance m3/h 33.4
Dozer capacity m30.067 without extention blade

WSM U15-3
I-15
2. Lifting capacity
Lifting capacity
The machine can lift the loads listed above when the hydraulic pressure is as specified. But the actual mea-
surements are based on "n = 1", which means some fluctuations are expected.
Measuring conditions:
(1) Hydraulic oil temperature: 50 ± 5 °C, riding operator (about 60 kg), engine at maximum rpm.
(2) The boom is inched until the other end of the machine comes off the ground or the boom circuit gets
relieved. Then the loads are measured.
Note:The loads also vary depending on the ground surface condition, dozer's ground-contact status,
operator's weight, remaining fuel and other factors.
(3) The boom swing position is set at the center.
(The machine may turn over if it is set off the center.)
*The above figures show the machine that is about to life a load.
In the above table, (T) means that the machine may turn over if the load is heavier. And (R) means that the
boom circuit gets relieved if the load is heavier.
Lifting posture Dozer Unit U15-3 Remarks
Maximum lifting capacity
(standard arm) (kgf) Crawler extended crawler retracted
60
Up kgf 215 (T) 215 (T)
Down kgf 280 (R) 280 (R)
Up kgf 100 (T) 185 (T)
Down kgf 135 (T) 195 (T)
Up kgf 475 (R) 475 (R)
Down kgf 475 (R) 475 (R)
Up kgf 275 (T) 475 (R)
Down kgf 315 (T) 475 (R)

WSM U15-3
I-16