TM 5-3895-371-24 & P
General Instructions (Before Disassembly of Hydraulic Motor).
(1) Parts and work area must be kept absolutely clean at all times. The Dynapower unit
must be cleaned externally with a commercial degreaser or steam and dried before hoses are discon-
nected and before the unit is removed from the application.
(2) Most service operations are carried out with the motor in a shaft down position. A 7 in.
sq. block of wood, 4 in. thick with a 2 in. round center hole may be used as a platform upon which the
motor may be positioned. A similar size hole in a work bench surface may be utilized as can the corru-
gated cardboard spacer packed at the end of a new Dynapower motor.
(3) When performing minor service work,
do not remove bearings, dowel pins,
block components unless they exhibit signs of galling, scratching, or excessive wear. On major over-
hauls, replace all bearings regardless of condition.
(1) Place hydraulic motor assembly (1) in a shaft down position. Remove plug (61) with
(5) Remove high pressure relief valve plug (59), O-ring (31), spring (58), and high pressure
relief valve plunger (57).
capscrew (53, fig. 3-60), hex nut (55), and spring seat assembly (54)
as a unit
to prevent changing of the setting (if pressure valve needs adjusting see para 3-5). Then remove O-ring
(52), inner spring seat (51), O-ring (50), spring (49), valve pilot (48), and seat (47).
(7) Remove low pressure relief valve plug (30), O-ring (31), spring (32), and plunger (33).
(8) Remove two shuttle valve plugs (40), and O-rings (31). Slide shuttle valve assembly (39)
(9) Unless leakage
do not remove plugs (38, fig. 3-60)
or O-rings (37).
leaking, replace O-rings (37).
(10) If cover (35) is to be removed it is important that the cover-housing relationship be
preserved. Mark both the housing (28) and cover (35) in such a way that upon reassembly, the relation-
ship can be maintained. For example, a scratch in the paint across the cover-housing parting line can be