Engine Serial Number; Specifications And Maintenance Information; Engine Cooling System; Radiator Pressure Cap - JLG G5-18A Service Manual

Engine: Perkins 1104D-44T
7.2

ENGINE SERIAL NUMBER

The Perkins 1104D-44T serial number is located on a tag
on top of the engine. Information contained in the serial
number is required in correspondence with the engine
manufacturer.
Supply the engine serial number and/or data tag
information when communicating about an engine or
engine components.
7.3 SPECIFICATIONS AND
MAINTENANCE INFORMATION
For engine, coolant and oil specifications, and
maintenance information, refer to Section 2, "General
Information and Specifications."
Note: Detailed Perkins engine service instructions
(covering disassembly, inspection, internal repair,
assembly, adjustment and troubleshooting information)
are provided in the appropriate Perkins engine service
manual.
7-4
7.4

ENGINE COOLING SYSTEM

7.4.1

Radiator Pressure Cap

For a 230° F (110° C) system, use a 13 psi (95 kPa)
radiator cap. An incorrect or malfunctioning cap can
result in the loss of coolant and a hot-running engine.
7.4.2 Radiator/Oil Cooler and Coolant
Heater Replacement
Before considering radiator or oil cooler replacement for
other than obvious damage, conduct a cooling system
pressure test check the coolant specific gravity, coolant
level, fan belt tension and dash panel temperature
indicator.
• If the engine runs hot, check the temperature of
the upper radiator hose.
• If the hose is not hot, the thermostat may be
stuck in the closed position.
• If the engine has overheated, performance may
suffer, indicating other damage including a leaking
cylinder head gasket, cracked cylinder head or
block, and/or other internal engine damage.
a. Radiator/Oil Cooler Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place an Do Not Operate Tag on both the ignition
key switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Thoroughly clean the engine and surrounding area,
including all hoses and fittings before proceeding.
5. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
6. Remove radiator cover and support (1).
7. Slowly turn the coolant overflow bottle cap and allow
any pressure to escape. Remove the overflow bottle
cap.
8. Place a suitable container beneath the radiator
petcock.
G5-18A, 2505