JLG ERT2669, Service And Maintenance Manual

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SECTION 4 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
31215923 4-3
Right Side Wheel Test (CE MARKET ONLY)
1. Place a 4 in. (10.16 cm) high block with ascension
ramp in front of right wheel of the oscillating axle.
2. From platform control station, select LOW drive
speed.
3. Set the DRIVE control switch into position and care-
fully drive the machine up ascension ramp until left
oscillating axle wheel is on top of block.
4. Verify the axle oscillates to maintain contact with the
ground/ramp. (All four wheels on the ground).
5. Raise machine platform above stowed position to
drive cutout height.
6. Carefully drive the machine back off the block and
ramp.
7. Have an assistant check to see that the right oscillat-
ing axle wheel that was on the block is in position on
the ground. The axle should oscillate so that all four
wheels maintain contact with the ground.
8. In the current position (platform raised and all four
tires on flat and level surface), carefully drive
machine up the ramp block again.
9. Have an assistant check to verify that the axle did not
oscillate and remained locked (one wheel is off of the
ground).
10. Carefully drive the machine back off the block and
ramp.
11. Lower the machine platform; the lockout cylinder
should then release and allow wheel to rest on the
ground. It may be necessary to activate DRIVE to
release cylinders.
12. If the lockout cylinders do not function properly,
have qualified personnel correct the malfunction
prior to any further operation.
Front Oscillating Axle Test (Non-CE Market Only)
NOTE: Begin the test with no load in the platform, in the
fully lowered position
1. Place a 6 in. (15.2 cm) high block with ascension
ramp in front of left wheel of the oscillating axle.
2. From platform control station, select HIGH TORQUE
drive mode or Aux Traction
3. After pressing the drive select switch, carefully drive
up ascension ramp until left front wheel is on top of
block
4. Raise the machine approximately 9 ft (Height varies
by model)
5. Select drive and move the control stick to the reverse
direction to carefully drive the machine of the block
and ramp.
6. Have an Assistant check to see that the left front
wheel remains locked in position off the ground.
7. Lower the machine platform to transport and acti-
vate drive, the front axle should unlock and allow
wheels to rest on the ground.
8. From platform control station, select HIGH TORQUE
drive mode or Aux Traction.
9. After pressing the drive select switch, carefully drive
up ascension ramp until right front wheel is on top of
block.
10. Raise the machine approximately 9 ft (height varies
by model).
11. Select drive and move the control stick to the reverse
direction to carefully drive the machine of the block
and ramp.
12. Have an Assistant check to see that the right front
wheel remains locked in position off the ground.
13. Lower the machine platform to transport and acti-
vate drive, the front axle should unlock and allow
wheels to rest on the ground.