Spicer 599967 - Manual

Tire Pressure Control System AX-796
Component Repair Procedure
Pneumatic Control Unit - Catridge Replacement Kits - 599968 & 599967
The following procedures describe the necessary work required for removal and replacement of the Dana Tire Pressure
Control System Pneumatic Control Unit (PCU) cartridge assemblies. This work requires removal of the pneumatic
control unit from the vehicle. Follow removal procedures in Dana TPCS Service Manual (AXSM-0010). This work
covers cleaning of PCU components only in cartridge areas. If a complete PCU cleaning is determined necessary or
desired, follow procedures in service manual under PCU cleaning.
CAUTION! Do NOT use cleaning solvents which are not compatible with elastomer or rubber components. Use of
brake cleaners, or solvents containing Xylene, or Methyl Ketone is not recommended.
1. Remove bottom cover plate screws (10e), cover plate (10a), and gasket (10b). If 3 channel system, remove
screws (10e), plate (10d), and gasket (10d).
2. Remove cartridges by gently prying on piston through the channel port. Note: 1)All cartridges with the exception
of the supply cartridge are normally open (8). The supply cartridge is normally closed (9). / Note: 2) On early
model PCUs, the normally open cartridges are not fastened together and will come apart on dis-assembly.
Replacement units are fastened together.
3. Verify that cartridge bores are clean from oil and debris. If debris is present, clean ports with suitable solvent.
4. Lube o-rings on new cartridges with silicone based “o-ring lube” and install into pneumatic control unit. Verify
normally closed cartridge is in supply port.
5. Install new base gaskets, reinstall cover plate and screws. Torque screws 40 to 45 in-lbs.
6. Install pneumatic control unit in vehicle.
7. Conduct system checkout to verify integrity of repairs.
NOTE: If cartridge o-rings are damaged during re-assembly, the o-rings themselves can be replaced. The o-rings are
not provided separately by Dana, however, they are available from most o-ring suppliers. See cartridge detail for
specific size and material information.