HF-7-602 Page 31
SECTION 6
DISASSEMBLY INSTRUCTIONS
Required tooling:
·
Trunnion should be used during disassembly. If a trunnion is not available, an overhead hoist and heavy
duty work table can be used. Work table should be capable of holding 700+ lbs.
·
Gear puller
·
Hydraulic cylinder, portable, hollow center
·
(2) 3/4-10 eye bolts
·
(2) 1/2-13 eye bolts
1. Inspect interior of blower for any signs of rotor contact (rotor to rotor, rotor tip to case, rotor end to bearing
housing). If signs of contact exist, use feeler gauges to measure clearances and record.
2. Inspect areas around drive shaft seal and vent passages in the bearing housing and air cylinder for any signs
of oil leaks.
3. Drain oil from gear-end and drive-end sumps by removing drain plugs (41). A small amount of oil from each
sump should be saved in the event that an oil analysis will be required.
4. Remove drive-end sump cover (5) by removing key (35) and screws (27 & 31). Slide cover off drive shaft.
5. Inspect drive shaft where shaft seal mates for damage and wear. Inspect oil seal (37).
6. Remove shaft seal by supporting external surface of drive-end sump cover near shaft seal with blocks of wood
and driving the oil seal from the cover using a seal driver tool (slightly smaller diameter than seal bore) and a
press or small hammer.
7. Remove gear-end sump cover (5) by removing bolts (27 & 31)
8. Using nut driver tool EQ144211-2, remove locknuts (24), washers (25), oil slinger (23), and spacers (20) from
gear-end of rotor shaft.
9. Inspect gears (18) for damage or excessive wear. Measure gear backlash using a dial indicator with a
magnetic base. Lock idler rotor from turning by wedging a shop rag between rotor tip and air cylinder. Position
dial indicator tip on drive rotor gear tooth perpendicular to gear. Rotate gear in both directions to measure total
backlash. Backlash should be measured in three places (every 1/3 rotor rotation) and be 0.0028-0.0042".
10. Match mark gears by making small punch marks on ends of two meshing teeth.
11. Remove timing gear and shrink disk assembly (19) by loosening the 12 bolts. If necessary, remove the three
bolts with washers to access 3/8-16 tapped holes. Use three 3/8-16 bolts as jack bolts to break assembly.
12. Using a gear puller, remove gear from idler rotor.
13. Remove bearing retaining plate bolts (17) and washers (16) from bearing housing.
14. Using nut driver tool EQ144211-2, remove locknuts (24), oil slinger (23), and spacers (21 & 22) from drive-end
of rotor shaft.
15. Attach mounting bracket to inlet side of air cylinder and mount blower on a trunnion and rotate until gear-end
of unit is up.
Summary of Contents for HELIFLOW HYEL AA
Page 27: ...HF 7 602 Page 26 Figure 5 5 FALSE BEARING EQ144211 5...
Page 29: ...HF 7 602 Page 28 Figure 5 8 HAND CRANK EQ144211 8...
Page 30: ...HF 7 602 Page 29 Figure 5 9 MECHANICAL SEAL DRIVER EQ144211 9...
Page 31: ...HF 7 602 Page 30 Figure 5 10 FALSE BEARING SPACER EQ144211 10...
Page 44: ...HF 7 602 Page 43 SECTION 8 PARTS LIST HYEL_AA 300HYE810 D Ref Drawing...
Page 55: ...HF 7 602 Page 54 SECTION 10 PARTS LIST HYEL_AB 301HYE810 B Ref Drawing...
Page 58: ......
Page 59: ......