BENDIX SD-01-503 User Manual

8. If piston assembly is nonmetallic (Figure 3), use a small

screwdriver and carefully insert blade of screwdriver
between two of the ears of the retainer ring in the
bottom of the piston (11) and pry retainer ring (15) out
of the piston and discard. Remove inlet/exhaust valve
spring (9) and the inlet/exhaust valve (10) and discard.
If piston assembly is metallic, disengage inlet/exhaust
valve spring (9) from recess in bottom of piston (11),
remove inlet/exhaust valve spring (9), and the inlet
exhaust valve (10) and discard.

9. Remove and discard fi lters (7) from unloader and

reservoir ports in governor body.

CLEANING AND INSPECTION

1. Clean all remaining parts in mineral spirits.

2. Inspect body for cracks or other damage. Be particularly

careful that all air passages in the body, exhaust stem,
and piston are not obstructed.

3. Check springs for cracks, distortion, or corrosion.

4. Replace all parts which are worn or damaged.

ASSEMBLY

Prior to assembly, lubricate the two lower body bores, all
o-rings and o-ring grooves with lubricant provided. Note:
Also spring guide and adjusting screw (if disassembled).

1. Install o-ring (12) in piston (11). Replace washer (13)

and retaining ring (14) on nonmetallic piston if removed
during disassembly.

2. Drop the inlet/exhaust valve (10) into place at the

bottom of the piston (11).

3. Nonmetallic Piston: Install the inlet/exhaust valve spring

(9) with the small end against the valve, place the
retaining ring (15) on top of the large end of the valve
spring (9) [concave side of retaining ring (15) facing
away from piston (11)], press into piston with thumb,
making sure ears of retaining ring (15) are seated into
piston (11) as far as possible.

Note: Do not use a press or hammer to install retaining
ring. Excessive force may damage the piston.

Metallic Piston: Install the inlet/exhaust valve spring (9)
with the small end against the valve. Press the spring
down until the larger coiled end snaps into the recess
inside the piston (11).

4. Install the piston o-rings (8) on the piston (11).

5. Install the exhaust stem spring (6) in the piston (11)

with the large coil end next to the piston.

6. Install the exhaust stem (5) through spring (6) and into

piston (11).

7. Install assembled piston (11) into the governor body

(2).

8. If the spring assembly was not disassembled, proceed

to Step 9. If the spring assembly was disassembled,
the following instructions apply: install on the adjusting
screw (4) in this order; lower spring seat (19), spring
guide (18), spring seat (19), pressure setting spring
(17), hex-shaped upper spring seat (16). Screw the
upper spring seat onto the adjusting screw until the
distance from the top of the seat to the bottom of the
adjusting screw head is approximately 1-7/8 inches.
Install the lock nut (3).

9. Install the adjusting screw (4) and spring assembly into

the governor body (2).

10. Install retaining ring (1) making certain that it seats

completely into the groove in the governor body (2).

If cover provided in kit is black rubber, (refer to Figure
2) install by pushing it onto the adjusting screw.

If cover provided in kit is clear nonmetallic, install o-ring
(20) and screw cover onto the adjusting screw. Tighten
until cover bottoms on governor body. Note: O-ring (20)
is used only on Hi-Temp and waterproof governors. If
cover provided in kit is blue nonmetallic place cover
over one edge of top of governor; with index fi nger
catch knob on top of cover and pull until cover snaps
into place.

Note: Nonmetallic cover should be at room temperature
for ease of assembly. Do not attempt to force cover on
square to the governor body.

11. Install fi lters (7) in governor body. The head of a pencil

makes a satisfactory installation tool.

INSTALLATION

1. If the governor is compressor-mounted, clean the

mounting pad on both the compressor and governor.
Clean connecting line, or lines. Be certain the unloading
port is clear and clean. If the governor is mounted remotely,
it should be positioned so that its exhaust port points
down. It should be mounted higher than the compressor
so that its connecting lines will drain away from the
governor.

2. Install

governor.

3. If compressor-mounted type, use the governor mounting

gasket provided.

4. Connect air lines to governor.

5. Perform operating and leakage tests as outlined under

Service Tests section.