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Pump Repair
To reduce risk of injury due to sprayer starting
unexpectedly, shut off engine before performing
checks or service.
WARNING
Disassemble Pump
1. See Displacement Pump Repair on page 10 to
remove pump.
2. Use a hammer on tabs of lug nut (214) to loosen
foot valve housing.
3. Fig. 7. Disassemble pump, but do not disassemble
piston rod (201) from piston housing (206) unless
either needs to be replaced. These two parts are
joined with high-strength (red) Loctiter. Joint must
be heated to disassemble.
Clean and Inspect All Parts
1. Clean all traces of sealant from all parts with a
compatible solvent.
2. Inspect all part for nicks and scratches. Replace
worn or damaged parts as they cause packings to
wear more quickl y and may result in poor pump
perfo rmance.
Repair Kit
Packing Repair Kit 235186 is available. Replace all
parts in kit for best results.
Parts included in kit are marked with an asterisk in text
and drawings. For example, 208*.
Assemble Pump
1. Fig. 7. If piston rod (201) and piston housing (206),
were disassembled, clean threads thoroughly.
Apply Loctite primer and then red Loctite to
threads and torque to 80 to 100 ft-lb (110 to
135 N.m). Allow to dry at least 1 hour.
2. Assemble onto piston seat (213): washer (212);
u-cup seal (218*) with lips toward ring; female
gland (211*) and then alternate white (210*) and
purple packi ngs (219*), all with lips facing up; male
gland (209*).
3. Install nut (208*) on piston seat (213). Hand tight-
en nut firmly.
4. Install ball (220*) in piston housing (206).
5. Apply blue Loctite to piston seat (213) threads and
screw asse mbly onto rod, hand tight.
TIP: Draw a line across male gland, nut and piston
housing for an alignment refe rence before tightening
piston and nut.
6. Place piston seat (213) in a vise. Hold packing nut
(208) steady with one wrench and use a torque
wrench to tighten rod assembly to 90--125 ft-lb
(122--170 N.m). Make sure reference line made in
step 5 is aligned.
7. Grease throat of intake housing (227). Assemble
into throat: male gland (204*), flat side first; alter-
nate white packings (225*) and purple packings
(203*) and then female gland, all with lips facing
down. Install packi ng nut (202) and hand tighten,
firmly.
8. Grease piston packings and inside throat pack-
ings.
9. Grease new o-rings (205*) and install on cylinder
(221). Slide cylinder into bottom of intake housing
(227) until yo u hear it snap.
10. Guide piston rod assembly into cylinder so piston
rod flats are aligned with opening in front of pump.
Push down until you hear another snap. Turn
pump over and push assembly in completely.
11. Align rod hole to front of pump with a screw driver.
12. Grease o-ring (223*), install on plug (224), install
plug and screws (222) loosely. Torque screws to
50--70 in--lb (5.6--8 N.m) in a crosswise pattern.
13. Install ball (216*) and ball guide (217) into foot
valve. Place pump assembly on foot valve and
push into place.
14. Screw on lug nut (214). Tighten lug nut securely
with a hammer.
TIP: Lug nut must be tight or pump will not prime.
Draw a line between intake housing and lug nut fo r an
alignment reference during operation.