Product Manual

335A-PRV-00
4
07/2011
Specifications Information and Repair Parts Manual DIAPHRAGM PUMPS
x
Diaphragm Pumps
3. During freezing weather, be sure to drain the pump when it is
not running. Remove discharge hose and tip unit towards
discharge side.
4. Keep pump clean. After use with liquids containing foreign
materials, flush with clean water.
REPLACEMENT OF FLAPPER VALVES
(Ref. No. W15)
1. Remove two bolts (Ref. No. W3) and remove suction priming
chamber (Ref. No. W2). Replace flapper (Ref. No. W15) on
flapper pin to locate on priming chamber.
2. Remove two bolts (Ref. No. W8) and remove discharge plate
(Ref. No. W7). Replace flapper valve on flapper pin to locate
valve on pump well (Ref. No. W1).
REPLACEMENT OF DIAPHRAGM
(Ref. No. P17)
1. Remove sheet metal guard (Ref. No. A4) by loosening hand
knob screws (Ref. No. A5).
2. Rotate pump until plunger arm (Ref. No. A2) is in the down
position.
3. Remove handle (Ref. No. A35).
4. Remove pump well (Ref. No. A3) by removing screws, (Ref.
No. A9/A10).
5. Remove diaphragm by removing three nuts (Ref. No. P12)
from bolts (Ref. No. P11).
6. Replace diaphragm and reverse steps 1 through 5 for
reassembly.
GEAR BOX OVERHAULING
A completely assembled gear box is available as a replacement part
(Ref. No. G28).
DISASSEMBLY
1. Remove diaphragm (Ref. No. P13) as described in
"Replacement of Diaphragm".
2. Remove crank (Ref. No. P5) by removing machine screw
(Ref. No. P6). Use screwdriver in slot of crank to release
clamp on output shaft (Ref. No. G8).
3. Drain oil from gear box by removing drain plug (Ref. No. G4).
4. Remove driver (Ref. Nos. A28/A32) from adapter (Ref. No.
G26) by removing four bolts (Ref. No. A27) plus 4 additional
bolts (Ref. No. A29) from engine mount bracket (Ref. No.
A16) for gas driver models. Slide driver back from adapter
until driver shaft disengages pinion (Ref. No. G20).
5. Remove adapter by removing four bolts (Ref. No. G27).
6. Remove gear box from pump base (Ref. No. A8) by
removing four bolts (Ref. No. A9 & A10).
7. Remove pinion/bearing assembly (Ref. Nos. G15, G24, G20,
G16) by pulling straight out. Use a slide hammer puller
gripping in pinion groove
8. Remove twelve bolts (Ref. No. G3) holding gear box halves
(Ref. Nos. G1 & G2) together.
9. Carefully separate gearbox halves.
10. Remove gasket (Ref. No. G22).
11. Remove output shaft/bearing assembly (Ref. Nos. G8, G9,
G12, G11, G12, G13) and idler pinion/bearing assembly
(Ref. Nos. G13, G14, G17, G18, G19).
12. Remove output shaft oil seal (Ref. No. G23)
13. Remove bearings (Ref. Nos. G15 & G16) from ends of input
pinion shaft (Ref. No. G20).
14. Remove bearings (Ref. Nos. G13 & G14) from ends of idler
pinion shaft (Ref. No. G17).
15. Remove internal spur gear (Ref. No. G19) and key (Ref. No.
G18) from idler pinion shaft.
16. Remove retaining ring (Ref. No. G10) and bearings (Ref.
Nos. G12 & G13) from ends of output shaft (Ref. No. G8).
17. Remove output gear (Ref. No. G11) and key (Ref. No. G9)
from output shaft.
REASSEMBLY
1. Assemble input pinion/bearing assembly, idler pinion/bearing
assembly, and output shaft/bearing assembly.
2. Install output shaft oil seal into gearbox output half. Lubricate
lip seal.
3. Slide output shaft through lip seal. Start output bearing in
bore in gear box output half. Position idler pinion bearing
assembly in its bore in output half. Simultaneously press
both assemblies into output half.
4. Install gasket on output half.
5. Position gear box input half; align shaft bearings with bearing
bores. Press gear box halves together, align pins in output
half with pin bore in input half.
6. Secure halves together with twelve bolts.
7. Slide input pinion/bearing assembly into bore in gear box
input half. Rotate pinion during installation to make sure gear
teeth align with internal spur gear teeth.
8. Install O-ring (Ref. No. G25) on outside of pinion bearing.
9. Reassemble gear box to pump base with four bolts.
10. Reassemble adapter to gear box with four bolts.
11. Align driver shaft key (Ref. No. A26) with keyway in pinion.
Slide driver into pinion, secure to adapter with four bolts (Ref.
No. A27).
a. (Gas engine only) Attach engine to engine mount
with four additional screw assemblies (Ref. No.
A29).
12. Reassemble crank to output shaft as described under
"Operation" section.
13. Replace diaphragm as described under "Replacement of
Diaphragm" section.
14. Fill gear box with oil as described under "Assembly" section.
15. Pump should be checked daily, weekly, monthly for proper
operation.
NOTE: Only qualified service personnel should attempt to repair this
unit. Improper repair and/or assembly can cause pump damage, driver
damage, and/or an electrical shock hazard depending on model.