SECTION 4 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
31215079
4-3
Right Side Wheel Test
1. Place a 4 inch (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 right
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, approximately 6 to 9 ft. (2 to 3m)
for the 330LRT and 430LRT.
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 the axle to oscillate. It
may be necessary to activate DRIVE to release cylin-
ders.
12. If the lockout cylinders do not function properly,
have qualified personnel correct the malfunction
prior to any further operation.
4.5
DRIVE PUMP PRE-FILL PROCEDURE
The drive pump should be pre-filled with recommended
hydraulic fluid prior to machine start up.
Before starting this procedure inspect the unit for any
damage incurred during shipping and handling. Make
certain all components are clean prior to filling with
hydraulic fluid.
The methods to pre-fill pump is as follows:
Pre-Fill of the Drive Pump Housing Without HOC
These types of pumps should never be dry started.
Pre-fill the pump as follows:
1. The drive pump has 2 case drain ports. Both are SAE
#12 ports. The lower port has a 3/4 in. hose going
back to tank. The other port has an SAE #12 plug in.
Using a 9/16 Allen wrench remove the plug.
2. Fill the hydraulic tank.
3. Fluid from the hydraulic tank will back flush into the
pump housing through the 3/4 in. case drain hose.
Air will be forced out of the open port on the pump.
When oil starts flowing out of the open port, re-
install and tighten the plug. The pump case is now
pre-filled.
Pre-Fill of the Drive Pump Housing With HOC
1. The drive pump has both case drain ports filled by
hoses due to the HOC.
2. Repeat steps 1 to 3 as above, except instead of loos-
ening the SAE #12 plug, loosen the hose on the bot-
tom of the case drain manifold, located near the
hydraulic tank. This is the hose connected to the
pump L2 port.
Priming the Gear Pump
The gear pump is mounted with the suction hose up. Air
trapped in this area can cause an air lock on start up.
during this period, the pump is running dry, which can
cause gear wear, which affects the volumetric efficiency
of the pump.
1. Fill the hydraulic tank to the full mark.
2. Using a 3/4 in. wrench, loosen the pressure hose
small section of the gear pump (steering section).
The hose fitting does not need to be removed, just
loosened enough to let the air escape.
3. When oil leaks at the hose end, re-torque the hose
end to 115 lb-ft (155 Nm). The pump is primed and
the pumps are ready to start.
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