JLG 534D-10 - Manual (Page 101)

6.3 534D-9, 534D-10 & 544D
Hydrostatic Drive Pump
6.2 DRIVE PUMP DESCRIPTION
Instructions in this section pertain mainly to general
specifications, towing, maintenance information, and
drive pump removal and installation procedures. for
internal drive pump service instructions and detailed
specifications contact your local JLG distributor.
See
6.3 DRIVE PUMP SERIAL NUMBER
The drive pump serial number plate is located on the front
of the drive pump case. Information specified on the
serial number plate includes the drive pump model
number, the drive pump serial number and other data.
Information on the serial number plate is required in
correspondence regarding the drive pump.
6.4 DRIVE PUMP SPECIFICATIONS
6.4.1 Drive Pump Maintenance
Cleanliness is of extreme importance. Before attempting
any repairs, thoroughly clean the exterior of the drive
pump to help prevent dirt from entering while performing
maintenance checks and procedures.
Your local JLG distributor can provide a suggested
maintenance schedule with references to pertinent
procedures and instructions in this manual. To help
prevent drive pump problems before they occur, follow
the maintenance schedule.
Note: Lubrication and Maintenance chart decals are
located inside the engine compartment access door.
These decals contain a general maintenance schedule
that should be followed to maintain the machine in good
operating condition. Refer to Section 2.5, “Service and
Maintenance Schedules.” The same schedule
information is presented in the appropriate Operation &
Safety Manual, with a detailed account of how to perform
the procedures.
6.4.2 Drive Pump Maintenance Schedule
Complete hydraulic maintenance information is located in
the appropriate Operation & Safety Manual.
Periodically, depending on operating conditions and
other factors, back flush the hydraulic oil cooler, which is
located in front the radiator. ALWAYS back flush the
hydraulic oil cooler after removing the drive pump for
repair or replacement.
The hydraulic oil cooler outlet hose, routed to the lower oil
cooler fitting, is located on the top of the drive pump. The
drive pump oil cooler inlet hose, routed to the upper oil
cooler fitting, is located on the top of the drive pump.
(Refer to Section 7.7.3, “Radiator/Oil Cooler and
Replacement.”)
Disconnect and back flush the oil cooler portion of the
radiator or the oil cooler (located behind the radiator) with
oil and compressed air until all foreign material is
removed. If necessary, remove the radiator or oil cooler
from the machine, and clean the oil cooler circuit using oil,
compressed air and steam.
Note: DO NOT use flushing compounds for cleaning
purposes.
6.5 DRIVE PUMP REPLACEMENT
Note: Contact the JLG Service Department if internal
drive pump repair is required during the warranty period.
Note: To help ensure safety and optimum performance,
replace the drive pump if it is damaged. Refer to the
appropriate parts manual for ordering information.
Cleanliness is of extreme importance. Before attempting
to remove the drive pump, thoroughly clean the exterior
of the drive pump to help prevent dirt from entering during
the replacement process. Avoid spraying water or
cleaning solution onto or near the drive pump shift
solenoids and other electrical components.
6.5.1 Drive Pump Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the drive pump control lever in (N) NEUTRAL,
engage the park brake and shut the engine OFF.
WARNING
DO NOT service the machine without following all
safety precautions as outlined in Section 1, “Safety
Practices,” of this manual.
WARNING
NEVER lift a drive pump alone; enlist the help of at
least one assistant or use a suitable hoist or overhead
crane and sling.