Power Jacks Neeter Drive Range-N - Manual (Page 9)

9
SPIRAL BEVEL GEARBOXES RANGE “N”
6.1.16 Assemble the input shaft (1)– do not fit into gear case (9) yet.
6.1.17 Assemble the gear assembly onto one end of output shaft (2)
6.1.18 Put output shaft (2) into gear case (9), ensuring it is in the same place as when disassembled and fit
rear
bearing (7).
6.1.19 Fit shaft end cap (4) this is a blank cover for 2 way and 2 way reverse units or bored out cover for 3
way
units.
6.1.20 When fitting the shaft end cap (4) replace the same amount and colour of gaskets as removed from
disassembly.
6.1.21 Bolt on shaft end cap (4).
6.1.22 Fit other shaft end cap (4) using the gaskets (18) removed – as detailed above.
6.1.23 Bolt on shaft end cap (4) – when fitting this cover, avoid putting extensive pre-load onto the bearings
(7), if necessary fit extra gaskets (18).
6.1.24 Ensure the shaft assembly turns freely and smoothly.
6.1.25 Fit centre bearing cup (8), ensuring the steel shims are fitted behind it.
6.1.26 Place the input gear (1) sub assembly into the case (9).
6.1.27 Fit shaft end cap (4) replace gaskets as detailed in 6.1.20 above, do not over tighten shaft end cap
(4)
damaging bearings
6.1.28 Rotate the shafts (1 & 2) to ensure they rotate freely and smoothly
6.1.29 If too tight or too much backlash then the assembly will need to be adjusted using additional gaskets
(18) under the input shaft end cap (4) and “gear side” shaft end cap (4) on the output and removal of
gaskets (18) from the rear cover end.
6.1.30 Check gear unit backlash. The backlash is measured in minutes of arc, measured on the output
shaft
(d
2
), by locking input shaft (d
1
) Backlash figures are detailed in the table in 6.1.31 below.
6.1.31 Backlash figures
Series 35 37 38 39 40
Ratio Min Max Min Max Min Max Min Max Min Max
1:1 12 24 16 21 13 20 12 16 9 13
1.5:1 10 20 13 22 10 17 10 13 8 11
2:1 9 18 8 15 9 16 7 10 7 10
3:1 9 18 7 13 8 14 7 10 7 10
4:1 -- -- 6 12 8 14 7 10 7 10
6.2 Ratio 2:1 and above, hollow output shafts and motor mounting flanged units
6.2.1 Procedure as above for output side. Input side (extended housing / motor mounting flange) is very
similar to the output side using gaskets to adjust the position of the gears. Assembling the output
into the case first, followed by the input sub assembly.