Complete PDF Service Manual for JCB Loadall models 520-50, 525-50, 525-50S. Models:
- 520-50 from Serial No. 754001
- 525-50 from Serial No. 789308
- 525-50S from Serial No. 1037581
Routine Maintenance 3
Attachments A
Body & Framework B
Service Electrics C
Manual Controls D
Hydraulics E
Loadall
Models: Transmission F
520-50
from Serial No. 754001
,Introduction
This publication is designed for the benefit of JCB Distributor Service Engineers who are receiving, or have received, training
by JCB Technical Training Department.
These personnel should have a sound knowledge of workshop practice, safety procedures, and general techniques associated
with the maintenance and repair of hydraulic earthmoving equipment.
Renewal of oil seals, gaskets, etc., and any component showing obvious signs of wear or damage is expected as a matter of
course. It is expected that components will be cleaned and lubricated where appropriate, and that any opened hose or pipe
connections will be blanked to prevent excessive loss of hydraulic fluid and ingress of dirt. Finally, please remember above all
else SAFETY MUST COME FIRST!
The manual is compiled in sections, the first three are numbered and contain information as follows:
1 = General Information - includes torque settings and service tools.
2 = Care & Safety - includes warnings and cautions pertinent to aspects of workshop procedures etc.
3 = Routine Maintenance - includes service schedules and recommended lubricants for all the machine.
The remaining sections are alphabetically coded and deal with Dismantling, Overhaul etc. of specific components, for
example:
A = Attachments
B = Body & Framework ...etc.
The page numbering in each alphabetically coded section is not continuous. This allows for the insertion of new items in later
issues of the manual.
Section contents, technical data, circuit descriptions, operation descriptions etc are inserted at the beginning of each
alphabetically coded section.
READ the section contents to locate machine types, machine type indentification IS NOT listed on individual pages.
All sections are listed on the front cover; tabbed divider cards align directly with individual sections on the front cover for rapid
reference.
Where a torque setting is given as a single figure it may be varied by plus or minus 3%. Torque figures indicated are for dry
threads, hence for lubricated threads may be reduced by one third.
'Left Hand' and 'Right Hand' are as viewed from the rear of the machine facing forwards.
This Service Manual covers the following machines:
520-50 (520 N. Am.) - from Machine Serial Number 754001
525-50 - from Machine Serial Number 789308
525-50S - from Machine Serial Number 1037581
9803/3620 Issue 5*
,Section 1 General Information Section 1
i i
Contents Page No.
Identification 1-1
Torque Settings 2-1
Service Tools
- Numerical List 3-1
- Section C 4-1
- Section E 5-1
- Section F 6-1
- Section H 7-1
- Section K 7-1
Sealing and Retaining Compounds 8-1
9803/3620 Issue 2*
, Section 1 General Information Section 1
1-1 1-1
Identification Plate Unit Identification
Your machine has an identification plate V mounted as The engine serial number is stamped on label W which is
shown. The serial numbers of the machine and its major fastened to the right side of the cylinder block, near the fuel
units are stamped on the plate. filter.
V
W
430250 S181760
Explanation of Engine Identification Number
Explanation of Vehicle Identification Number (VIN)
AA 50261 U 500405 P
A B C D E
SLP52050RE0754001
A B C D E A Engine Type:
A series
A World Manufacturer Identification SLP = JCB AK = 4 cylinder turbo - low emission, stage 1
B Machine Model 520-50 AR = 4 cylinder naturally aspirated - low
C Year of Manufacture S emission, stage 1
P = 1993 V = 1997 1 = 2001 R Series
R = 1994 W = 1998 2 = 2002 RE = 4 cylinder naturally aspirated, low
S = 1995 X = 1999 3 = 2003 emission, stage 2
T = 1996 Y = 2000 4 = 2004 RG = 4 cylinder turbo, low emission stage 2
D Manufacturing Location E = England RJ = 4 cylinder air to air charge cooled, low
E Machine Serial Number 0754001 emission, stage 2
Machine Model Explanation B Build Number
C Country of Manufacture
520 - 50 D Engine Serial Number
FG H E Year of Manufacture
If service information or parts are required, the complete
F 500 Series machine range
engine number should be quoted.
G 2.0 tonnes lift capacity
H 5.0 metres lift height If there is also a number marked ‘TPL No’, this should be
quoted also.
The serial number of each major unit is also stamped on the
unit itself. If a major unit is replaced by a new one, the serial If a short engine has been fitted in service, two engine serial
number on the identification plate will be wrong. Either numbers and a TPL No. are stamped on the serial number
stamp the new number of the unit on the identification plate, plate as at Z. All the numbers should be quoted when
or simply stamp out the old number. This will prevent the requiring parts or information.
wrong unit number being quoted when replacement parts
are ordered. Note: Where the procedures in this manual differ according
to engine types, the text and/or illustrations will specify
The machine and engine serial numbers can help identify which engine types apply.
exactly the type of equipment you have.
Transmission and axle identification is shown on the next
page.
9803/3620 Issue 4*
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