M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
N O T E
Perform steps (7) and (8) if plugs were
Coat threads of two plugs (6) and
elbow (5) with pipe thread sealing
Install two plugs (6) and preformed
packings (7) in housing (3).
Apply hydraulic oil to preformed
packings (4) and (2).
Install preformed packing (4) and elbow
(5) in housing (3).
Install two preformed packings (2) and
fittings (1) in housing (3).
N O T E
There are two models of control valves.
(Snap-Tite, no longer available as an assembly) has an
SAE #4 brake port. Model B (Dana) has an SAE #6
brake port. Installation procedures are identical for
both. However, if replacing Model A with Model B,
elbow located between hoist motor control valve and
brake port hose must be replaced (step 6, substep (7)).
Install two preformed packings (1) and control valve (2).
Apply sealing and thread locking compound and install four lockwashers (3) and screws (4).
Follow-on Maintenance. Install hoist control valve hydraulic hoses and tubes (para 17-2.1).
END OF TASK