JLG 4013PS Service Manual - Manual (Page 113)

8-3 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
Hydraulic System
8.2 SAFETY INFORMATION
Petroleum-based hydraulic oils are used in this machine.
The temperature of hydraulic oil increases during the
operation of various hydraulic functions. A heated
petroleum-based hydraulic oil presents a fire hazard,
especially when an ignition source is present.
Accordingly, periodically inspect all hydraulic system
components, hoses, tubes, lines, fittings, etc. Carefully
examine any deterioration and determine whether any
further use of the component would constitute a hazard.
If in doubt, replace the component.
Whenever you disconnect a hydraulic line, coupler, fitting
or other component, slowly and cautiously loosen the part
involved. A hissing sound or slow seepage of hydraulic oil
may occur in most cases. After the hissing sound has
ceased, continue removing the part. Any escaping oil
should be directed into an appropriate container. Cap or
otherwise block off the part to prevent further oil seepage.
Hydraulic system maintenance will, at times, require that
the engine be operated. Always follow safety
precautions.
A major cause of hydraulic component failure is
contamination. Keeping the hydraulic oil as clean as
possible will help avoid downtime and repairs. Sand, grit
and other contaminants can damage the finely machined
surfaces within hydraulic components. If operating in an
exceptionally dirty environment, change filters and
inspect the oil more often. When servicing the system,
cap or plug hydraulic fittings, hoses and tube assemblies.
Plug all cylinder ports, valves and the hydraulic reservoir,
and pump openings until installation occurs. Protect
threads from contamination and damage.
Some hydraulic functions are actuated by interfacing with
electrical system components (switches, solenoids and
sensors). When the hydraulic system is not functioning
properly, check the electrical aspect of the malfunctioning
circuit also.
8.3 HYDRAULIC PRESSURE DIAGNOSIS
Kits are available to use for hydraulic system
maintenance and troubleshooting. The kits are contained
in a durable polyethylene carrying case for demanding
field service conditions.
The hydraulic pressure test kit is used to pressure test the
various hydraulic components in the hydraulic system.
The kit includes:
• Gauges for testing high and low pressure circuits
• Fittings, couplers and hoses
• Durable carrying case
A flowmeter test kit is used to pinpoint hydraulic system
faults. It includes a flowmeter with load valve, magnetic
base, photo tachometer head and flex arm. The kit
features:
• Bi-directional for unrestricted connection and
simplified testing
• Internal by-pass to protect system and tester
from over-pressure
• Measures up to 60 GPM and 6000 psi
• Durable carrying case
Contact your local authorized service distributor for
ordering information.
WARNING
DO NOT service the machine without following all
safety precautions as outlined in Section 1, “Safety
Practices,” of this manual.
Part
Number
Description
Approximate
Weight
Price and
Availability
70000652
Dial Hydraulic Pressure
Test Kit
4,5 kg
(10 lbs)
Consult Factory
70000101
Digital Hydraulic Pressure
Test Kit
3 kg
(7 lbs)
Consult Factory
70027911
Digital Hydraulic Pressure
Test Kit
3 kg
(7 lbs)
Consult Factory
1321107 Hydraulic Flowmeter Kit 12,7 kg
(28 lbs) Consult Factory