BENDIX BW1450 manual Cleaning & Inspection, Assembly

the end cover. Remove and discard the three sealing rings. One sealing ring is located in the groove on the sealing plate and the other two are in grooves in the end cover.

2.Remove 1/4" cap screw from the bottom of the purge valve and remove the diaphragm washer, exhaust diaphragm and purge valve. Discard the exhaust diaphragm and purge valve. Remove purge piston. Note: Hold piston down when removing cap screw due to spring tension.

3.Remove and discard the check valve assembly in the recess at the delivery port of the end cover.

4.Remove the safety valve from the end cover (only if it has been determined that it needs replacement during service checks).

5.To remove the thermostat see the appropriate section in this manual (only if it has been determined that it needs replacement during service checks).

6.Remove purge piston and spring from the top side of the cover.

7.Remove o-ring from the purge piston and discard the o-ring.

8.Remove the four 1/4" cap screws and lockwashers that secure the sealing plate to the desiccant cartridge. Separate the sealing plate from the desiccant cartridge and discard the sealing ring at the base of the cartridge.

CLEANING & INSPECTION

1.Using mineral spirits or an equivalent solvent, clean and thoroughly dry all metal parts.

2.Inspect the interior and exterior of all metal parts that will be reused for severe corrosion, pitting and cracks. Superficial corrosion and or pitting on the exterior portion of the upper and lower body halves is acceptable.

3.Inspect the bores of both the end cover for deep scuffing or gouges.

4.Make certain that all purge valve housing and end cover passages are open and free of obstructions.

5.Inspect the pipe threads in the end cover. Make certain they are clean and free of thread sealant.

6.Inspect the purge valve housing bore and seat for excessive wear and scuffing.

7.Inspect the purge valve piston seat for excessive wear.

8.Inspect all air line fittings for corrosion. Clean all old thread sealant from the pipe threads.

9.All o-rings removed should be discarded and replaced with new o-rings provided in appropriate kit(s).

Any component exhibiting a condition described in step 1 to 8 should be replaced.

ASSEMBLY

Prior to assembly, coat all o-rings, o-ring grooves, and bores with a generous amount of barium base lubricant.

Important Note: The single exception to prelubrication is the sealing ring between the desiccant cartridge and sealing plate. Refer to step number 8 for proper installation of this sealing ring. Refer to Figure 6 during assembly unless otherwise advised.

1.Place return spring into cavity in the center of top side of end cover.

2.Install the purge piston o-ring on the purge piston and place the purge piston inside the return spring installed in Step 2.

3.Turn end cover over on a flat clean surface (making sure purge piston and return spring remain in proper position.) Compress the return spring by pushing down on the end cover and align square shank of purge piston into mating hole in the end cover.

4.Place the diaphragm washer, diaphragm, and purge valve onto the 1/4" cap screw.

5.Install the 1/4" cap screw with parts on it into exhaust cover and torque to 60-80 inch pounds.

6.Install safety valve (if removed) and torque to 120-400 inch pounds, making sure that the exhaust hole is pointed downward when the dryer is installed.

7.Install thermostat (if removed). Refer to instructions pertaining to thermostat installation under section Thermostat Assembly.

8.Place sealing ring on bottom of desiccant cartridge. The desiccant cartridge, sealing ring and sealing plate should be wiped and free of lubricant prior to this assembly procedure. Attach cartridge to plate (smooth side of plate opposite cartridge) with four 1/4" socket head cap screws and lockwashers. Torque to 80-100 inch pounds.

9.Install the two sealing rings in the recesses of the end cover.

10.Install the check valve assembly into the end cover making sure the tang on the check valve assembly fits into the mating recess in the end cover.

11.Place desiccant cartridge and sealing plate assembly onto end cover. (Taking care not to displace sealing rings.) The large hole in the sealing plate must line up with the check valve and spiral pins in the sealing plate must enter corresponding holes in the end cover.

12.Install the outer sealing ring on the sealing plate. Place the outer housing over the desiccant cartridge (lining up marks made on the outer housing and end cover prior to disassembly) and retain with eight 3/8" hex head bolts, special washers, and lock nuts. Refer to Figure 8 for torque pattern. Torque to 270-385 inch pounds. Note: If

9