16
MHD56208 - Edition 3
Assembly
General instructions
• use new gaskets and seals.
• replace worn parts.
• assemble parts using match marks applied during
disassembly. Compare replacement parts with originals to
identify installation alignments.
• Coat inside of cylinders, motor housing cylinder bores and
‘O’ rings with lightweight grease (synthetic PTFE-based
silicone lubricant recommended).
Motor Assembly
Refer to Dwg. MHP2005 on page 20.
1.
Press bearing (27) into motor housing (28) and secure with
retainer ring (26).
2.
Press crankshaft (25) through bearing (27) and secure with
retainer ring (31). Crankshaft should rotate freely.
• For Fenner and NEMA style motors be sure key (20) is
inserted into crankshaft (25).
3.
Lubricate ‘O’ rings (22) and place in grooves on piston
heads.
• Ensure piston needle roller bearings are contaminant-free.
Lubricate bearings with a molybdenum-lithium based grease
(“Lubriplate, Mo-Lith #2” recommended).
4.
With eyebolt on motor housing oriented UP, place a piston
assembly (23) on crankshaft pin with connecting rod pointing
DOWN. Refer to Dwg. MHP1837 on page 16.
Piston to Crankshaft Assembly
(Dwg. MHP1837)
6.
Place a piston ring set (21) over one piston and compress
with fingers. When correctly installed, rings snap together.
Insert one cylinder (19) through motor housing and over
these rings. Repeat for other piston.
• For Fenner style motor piston ring (21) is one piece.
7.
Orient stud on cylinder to the back of motor. This will align
ports in cylinder with those in motor housing.
8.
Place a gasket (18) and cylinder cap (17) on each cylinder.
There is a recess in cap for cylinder stud to fit in, to maintain
cylinder alignment during operation. Loosely secure with
washers (3) and capscrews (2). Repeat for opposite cylinder.
9.
Rotate crankshaft and repeat steps 2 through 7 for the other
piston assembly.
10. Once both piston assemblies and liners are installed, tighten
capscrews (2).
11. Check rotation of crankshaft assembly. Assembly should
rotate smoothly without sticking, binding or knocking of the
piston heads on the top of the cylinders. Correct any
problems before continuing assembly.
12. Press rotary valve bushing (12) into rotary housing (9).
Ensure pin in housing and slot in bushing align correctly.
Press until bushing is flush.
13. Press bearing (14) into rotary housing.
14. Install retainer ring (8) into rotary housing.
15. Press rotary valve (15) through bearing (14) and into rotary
housing.
16. Press bearing (7) onto rotary valve and into rotary housing.
Secure with retainer ring (6).
• During installation of bearing (7), support both the inner and
outer race of bearing.
17. Check rotation of rotary valve. Rotation should be smooth
without sticking or binding. Correct any problems before
continuing assembly.
18. Position pin in crankshaft (25) at the top (closest to eyebolt).
Place gasket (13) on motor housing. Lift rotary housing onto
motor housing (counterweight of the rotary valve will rotate
to the bottom). Align pin in the crankshaft with hole in rotary
valve and place both housings together.
19. Secure with washers (3) and capscrews (2).
20. Align gasket (5) and rotary housing cover (4) with holes in
rotary housing (9) and secure with washers (3) and capscrews
(2).
21. Insert seal (43) into plate (45) and secure with retainer (42).
For Fenner style motor insert bearing (7) and retainer ring (8)
into plate (45).
22. Carefully insert seal tool (46) through plate and seal. This
expands seal to fit over crankshaft (25).
• Fenner style motors will not have seal (43), retainer ring (42)
or washer (3).
23. Place gasket (44) into recess in motor housing (28).
24. Using finger pressure place plate assembly over crankshaft
and push. As crankshaft comes through seal, installation tool
will be pressed out.
25. Secure plate with capscrews (2) and washers (3). For Fenner
style motor secure plate (45) with capscrews (10).
26. Place gasket (5) onto rotary housing cover. Place this
assembly onto rotary housing (9) and secure with washers (3)
and capscrews (2).
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