Maintenance Procedures Every 2000 Hours Or Yearly; Hydraulic System; Oil Change - Yale 524150797 Maintenance Manual

8000 YRM 1666
tire for embedded rocks, glass, wire, pieces of metal,
holes, cuts, and other damage. Remove any object
that will cause damage. Check for loose or missing lug
nuts or wheel bolts. Remove any wire strapping or
other material that is wrapped around the axle to

Maintenance Procedures Every 2000 Hours or Yearly

HYDRAULIC SYSTEM

Oil Change

WARNING
Always wear the proper protective equipment
including eye protection and petroleum-resistant
gloves when handling hydraulic oil. Thoroughly
wash oil from exposed areas of skin as soon as
possible.
Completely lower forks
pressure before disassembling any part of the lift
pump or disconnecting any hydraulic hoses.
The hydraulic oil is hot at normal operating
temperatures. Be careful when draining the oil.
Never check for leaks by putting hands on
hydraulic lines or components under pressure.
Hydraulic oil under pressure can be injected into
the skin.
CAUTION
Protect the hydraulic system from dirt and
contaminants when
system.
Never operate the pump without the proper
amount of oil in the hydraulic system. The
operation of the hydraulic pump with low oil levels
will damage the pump.
NOTE: The hydraulic oil should be changed after the
initial 350 hour break-in period and then every 2000
hours thereafter.
to relieve hydraulic
servicing the hydraulic
Maintenance Procedures Every 2000 Hours or Yearly
prevent damage to the axle seal. Make sure the wheel
bolts are tight. When installing the tire and wheel, snug
the wheel bolts, then tighten to half the torque value,
then tighten to the full torque value. Tighten the nuts in
a cross pattern to properly seat the wheel to the hub.
Lower the forks, turn the key switch to the OFF
position, and disconnect the battery. Remove drive unit
compartment cover. Remove the screws securing
retaining brackets to the bottom of the lift pump.
Slightly twist the reservoir from the hydraulic pump
andmotor assembly to remove. Recover the reservoir
O-ring. Empty hydraulic oil into a suitable container
and discard in accordance with local regulations.
Clean hydraulic reservoir using a suitable cleaning
solution and dry with compressed air. Clean and
inspect strainer. Replace strainer if clogged or
damaged. Clean and check reservoir O-ring for
brittleness or damage. Replace as necessary.
Make sure reservoir is clean and dry. Lubricate the O-
ring with a thin coating of grease and position it around
the lip of the reservoir as removed. Install reservoir
into the pump flange. If the O-ring shifts out of place
during installation; stop, reposition the O-ring, and
resume installation. Install retaining clamps and secure
using screws as removed. Add hydraulic oil through
breather filler pipe until at Max mark on reservoir.
Install breather cap and tighten. Raise and lower forks
several times to bring the oil to normal operating
temperature. Then recheck hydraulic oil level. DO
NOT OVERFILL. Reconnect the battery, turn the key
switch to the ON position, and fully cycle the lift and
lower functions several times to expel air from the
hydraulic system. Recheck the hydraulic oil level and
add as necessary. Reinstall the drive unit compartment
covers and return to service.
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