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AVERY A-R-V-MMBF-MMBG-MMY
Fig. A41—AII of the seals on the piston rod anti in fhe end cop should be renewed at overhaul.
Paragraphs 410-410A
adjustable but the one under the rear end cap operates only when raising the implement and has a spring which permits the valve to unload at 120-125 psi. The other release valve located under the front end cap operates only when the implement is lowered and has a much ^'heavier" spring which unloads at 1100 psi. Both valves should be removed and inspected for bent or broken springs and condition of valve balls and seats. Care must be exercised when removing the valves to prevent damage to the bores in the case. Renew the small seal ring on
each valve seat and do i:he same to the balls if they show signs of not seating properly. Reseat a new ball by a few sharp blows, using a hammer and a brass drift. After resissembling the parts in the order shown, make certain that the small spring in each case is sealed straight in the retainer, the head of which should be flush or slightly within the case uhen fully tightened. 410A. EARLY TYPE RELEASE VALVES. On the older Avery built Avery tractors, the release valves require a different servicing procedure
26 27 27 m
Fig* A4tl—Removal of rear end cap subassembly from Avery hydraulic power unit. 1. Medium seal rinsr 3. Back-up washer
2. Larse iieal ring 4. Pipe plug 5. End cap
Fig. A43'^Assembly sequence of rear release valve. A similar valve having a much Mti0er spring is mounted under the front end cap at opposite end of the power un}t. Refer fo Fig. A44 for early type release valves, 20. Spring 21- Valve
23. Seal ring 24. Seat 25. Ball
50. 52. 53. 56.
End cap—rear Plug Gasket Mounting plate (A&R) 58. Washer—{modeU A&R) 61. Plug
26. Spring 27. Reteimtr
62. Gaakvt 68. Expanaion plug 64. Retainer-relief 65. 66. 67. 70.
Spring-relief valve Shim .Cai" Gasket Cylinder
fig, A39-^Bxploded view of the hydraulic power unit (work cylinder & valves unit) used on late production Avery built and early producfion MinneapoliS'Moline built Avery tractors.
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