Crane PROSSER 4NX07 Series, Installation And Operation Manual

9

Apply pipe sealant to pressure gauge assembly and tighten 
into pipe plug hole (see Fig. 2). Pressurize motor housing 
to 10 P.S.I. Use a soap solution around the sealed areas 
and inspect joints for “air bubbles”. If, after fi ve minutes, 
the pressure is still holding constant, and no “bubbles” are 
observed, slowly bleed the pressure and remove the gauge 
assembly. Replace the pipe plug using a sealant. If the 
pressure does not hold, then the leak must be located.

CAUTION !  - Pressure builds up extremely 
fast, increase pressure by “TAPPING” air 
nozzle. Too much pressure will damage 
seal. DO NOT exceed 10 P.S.I. in motor 
housing.

F-2) Impeller, Volute and Exclusion Seal Service:
F-2.1) Disassembly and Inspection:

To clean out volute (7), disconnect power, remove cap 
screws (34) and lockwashers (22), vertically lift motor and 
seal assembly from body (7). Clean out body if necessary. 
Inspect gasket (24) and replace if cut or damaged. Clean and 
examine impeller (2) for pitting, wear, cracks or breakage, 
replace if required.

If impeller (2) requires replacing, remove jam nut (29) by 
placing a fl at screwdriver in the slot of the end of the shaft to 
hold the shaft stationary while unscrewing the impeller (2). 
Once impeller (2) is removed, remove spacer (32) on SED 
series or spacer (32) and shims (39) & (40) on SEDH series, 
and exclusion seal (31) if damaged or cut.

F-2.2) Reassembly:

Position exclusion seal (31) on shaft until it seats against the 
stationary portion of seal (1). On SED series pumps place 
spacer (32) on shaft until it seats against exclusion seal (31). 
On SEDH series pumps place spacer (32) and shims (39) 
& (40) on shaft until it seats against exclusion seal (31). To 
install impeller (2), clean the threads with loctite cleaner and 
screw impeller (2) onto the shaft hand tight. Apply thread 
locking compound to shaft threads and install nut (29). On 
SEDH series pumps shim to within .005/.015 from Impeller 
to Volute. Torque to 40 ft. lbs. Rotate impeller to check for 
binding. 

Position impeller and motor assembly on volute (7). Apply 
thread locking compound to cap screw (34) and position 
lockwasher (22) on cap screw (34) and screw into volute 
(7). Torque to 8 ft. lbs. Check for free rotation of motor and 
impeller.

F-3) Motor,  Bearing  and Seal Service
F-3.1) Disassembly and Inspection:

To examine or replace the motor (14), bearing (21) and 
shaft seal (1), disassemble volute and impeller as outlined 
in paragraph F-2.1. Drain oil from motor as outlined in 
paragraph F-1.3.

Position unit upright, using blocks to avoid resting unit on 
shaft. Remove gland nut (12b), friction rings (12c) and 
grommet (12d) from motor housing (11), see Figure 6. 
Remove socket head cap screws (36) and lift motor housing 
(11) from lower end bell (10). Slide motor housing (11) up 
cable (12), until wire connectors and ground screw are 
exposed. Remove cable lead wires from motor lead wires by 
disconnecting wire connectors (19) and ground screw (20) 
from motor (14). The wiring connections should be noted to 
insure correct connections when reassembling.

Motor -

 Remove the motor bolts and lift motor stator from 

motor rotor and lower end bell (10). Unscrew conduit bushing 
(16) from lower end bell (10) and lift motor rotor, shaft, 
bearing (21), rotating portion of seal (1), washers (25) & (33), 
and conduit bushing (16) from lower end bell (10). Inspect 
windings for shorts and check resistance values. Check rotor 
for wear, if rotor or the stator windings are defective, the 
complete motor must be replaced.

To test the temperature sensor (if equipped), check the 
continuity between the black and white wires. If found to be 
defective contact a motor service station or Barnes Service 
Department. Check motor capacitor (18) on single phase 
units with an Ohm meter by fi rst grounding the capacitor 
by placing a screwdriver across both terminals and then 
removing screwdriver. Connect Ohm meter (set on high 
scale) to terminals, if needle moves to infi nity ( 

∞

 ) then 

drifts back, the capacitor is good. If needle does not move 
or moves to infi nity (

∞

) and does not drift back, replace 

capacitor (18).

Seal -

 Remove rotating member (1a), spring (1c) and 

retaining ring (1d) from shaft. (see Figure 3). Examine all seal 
parts and especially contact faces. Inspect seal for signs of 
wear such as uneven wear pattern on stationary members, 
chips and scratches on either seal face. 

DO NOT

 interchange 

seal components, replace the entire shaft seal (1). If replacing 
seal, remove stationary (1a) from lower end bell (10) by 
prying out with fl at screwdriver.

CAUTION ! - Handle seal parts with extreme care.  
DO NOT scratch or mar lapped surfaces.

Bearing -

 Examine bearing (21) and replace if required. If 

replacement is required, remove bearing (21) from motor 
shaft using a wheel puller. Washers (25), (33) and conduit 
bushing (16) can now be removed from motor shaft.

IMPORTANT ! - All parts must be clean before 
reassembly.

FIGURE 2

E

N
G

L

I

S

H

Pressure Gauge 

Assy

Remove Plug

Í

10 PSI AIR