Pump Repair
WARNING
To reduce risk of injury due to sprayer starting unexpectedly, shut off engine before performing checks or service.
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 quickly and may result in poor pump performance.
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 packings (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 assembly onto rod, hand tight.
TIP: Draw a line across male gland, nut and piston housing for an alignment reference 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 packing 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 you 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 for an alignment reference during operation.
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