TRACK 4733014 - Caterpillar

Nitrogen Charging Procedure
Table 3
Tools Needed    
Part Number     Description     Qty    
175-5507     Nitrogen Charging Group     1    
175-7410     Nitrogen Charging Fitting Gp (1)     1    
( 1 ) This is optional.
Dry nitrogen is the only gas approved for use in the suspension cylinders. Charging the suspension cylinders with oxygen gas will cause an explosion. This danger will not happen if nitrogen cylinders with standard CGA (Compressed Gas Association, Inc.) Number 580 Connections are used.When you order nitrogen gas, be sure that the cylinders are equipped with CGA No. 580 Connections. Do not use color codes or other methods of identification to tell the difference between nitrogen cylinders and oxygen cylinders.Never use an adapter to connect your nitrogen charging group to a valve outlet used on both nitrogen, oxygen or other gas cylinders. Be sure you use dry nitrogen (99.8% purity).
Attach the 7S-5437 Nitrogen Charging Group to the quick couplers or to the charging valves at each suspension cylinder.Note: To prevent oil flow into the charging hoses, do not open the charging valves at this time.
Turn the tee handles on the 7S-5106 Chucks clockwise. This opens up charging valves (2). This allows nitrogen to flow to charging valves (2) .
Open the shutoff valves in order to allow nitrogen to flow to the 7S-5106 Chucks .
To protect the wiper seals on the front suspension cylinders from damage when the gauge blocks are inserted, make sure the gauge blocks include the chamfer.
Illustration 5 g01673855
Allow nitrogen into the suspension cylinder until gauge block (6) and any required shims can be inserted between the axle and the suspension cylinder. Lower the nitrogen pressure until the housing of the strut is resting on gauge block (6) .Note: If one suspension cylinder has extended to the correct amount before the other suspension cylinder, close the shutoff valve for that suspension cylinder. Continue allowing nitrogen into the other suspension cylinder until the correct extension has been reached.
Adjust the nitrogen regulator in order to provide 3620 kPa (525 psi) for the 773F and 3720 kPa (540 psi) for the 775F.
Close both shutoff valves.
Turn the tee handles on the 7S-5106 Chucks counterclockwise.
Turn the swivel nut clockwise on charging valves (2). This closes charging valves (2) .
Remove the 7S-5437 Nitrogen Charging Group .
Install valve caps (1) on charging valves (2) .
Tighten valve caps (1) to a torque between 2 N m (18 lb in) to 3 N m (27 lb in).
Start the machine.
In order to remove gauge blocks (6), raise the truck body or the water tank and turn the steering wheel so that the front wheels move. The suspension cylinders should raise. When the suspension cylinders are not resting on gauge blocks (6), remove gauge blocks (6) .
Operate the machine through a load and a dump cycle.
Verify that the correct exposed exposed rod dimension is achieved. The correct amount is 170 mm (6.7 inch) plus any required shims. Record this measurement. Use these recorded measurements as a reference when