Service manual

WORKSHOP MANUAL
300R 400R
WINGET REVERSING DRUM CONCRETE MIXERS
ISSUE 8 2012
Ref: SHSC1216
Refit the Edge Rollers and Water Tank or Flowmeter as described previously. Run the
mixer, check the operation of the Drum coating the Rollers/Gear with open gear
lubricant. Stop the engine and replace the inspection covers.
Drive Chain Adjustment
The Drive Chain is located behind the cast cover on the front of the Mainframe. The
cover contains an inspection aperture through which the Chain Tension can be checked.
The Tension is correct when the chain deflects 8mm-12mm mid way between the
sprockets.
To adjust the chain, remove the Inspection cover on the L/H side of the Drum Housing.
Slacken the three nuts on the lower Bearing Bracket, do not slacken the nuts too much
to avoid oil leaks following chain adjustment. Using the adjusting screw above the
Bearing Bracket increase or decrease tension on the chain as necessary. Lock up the
nuts. Replace the Inspection Covers.
Drive Chain/Sprocket Replacement
Drain the oil from the Chain case. Remove the setscrews and lift the Cast Chain Cover
from the Mainframe. The joint between the Chain Cover and Backplate/Mainframe is
made with Silicone Sealer and the Cover may require gently prising from the Mainframe.
Slacken the Adjustable Bearing Bracket as previously described to release the Chain
Tension. Disconnect the Chain split link and remove the Chain.
To remove the upper sprocket cut the locking wire, remove the special screws and
retaining washer, pull of the sprocket. Take care not to lose the key. In some cases it
may be necessary to use a suitable two legged puller.
To remove the Lower Sprocket remove the Circlip and Grubscrew. Pull off the sprocket
taking care not to lose the key. In some cases it may be necessary to use a suitable two
legged puller.
Reassemble in the reverse order taking care when refitting the lower sprocket that the
shaft is not moved backwards.
Re-tension the Chain as previously described on page 10.
Ensure the joint faces on the Cover and Backplate are clean. Apply a generous bead of
Silicone Sealer to the Cover, allow the sealer to cure for a few minutes then refit the
Covers.
Top up the oil through the inspection aperture and refit the cover plate.