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INSPECTION AND CLEANING
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TM-9-6115-667-13P Power Unit Diesel Engine Driven 2 1/2 Ton Trailer Mounted 30 kw 50/60 Hz PU-803 Manual
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PREVENTATIVE MAINTENANCE SCHEDULE
TM9-6115-667-13&P heard.    The  bearing  housing  contains  two  seal  check balls  which  are  retained  by  hex  socket  type  plugs.    The hex socket plugs can be viewed from the outside of the bearing  housing  (9).    The  check  balls  and  hex  socket plugs  are  not  field  serviceable  items  and  therefore,  are not shown in figure 3.  The purpose of the seal balls is to prevent oil pressure from damaging the drive shaft seals in  the  event  hydraulic  system  supply  and  return  hoses are  connected  incorrectly  (see  CONNECT  HOSES  on page 7 of this manual).  If the balls do not rattle, this may mean  they  are  jammed  because  of  fluid  contaminants. Replace the bearing housing (9). Drive Shaft (11, figure 3) and Idler Shaft (6, figure 3) Shaft  diameters  at  bearing  and  seal  locations  must  be smooth.      Grooves,   roughness   or   a   reduced   diameter indicate  fluid  contamination  or  damaged  bushings.    Grit particles   may   have   been   imbedded   in   the   bushings grinding into the hardened shaft.  If abnormal shaft wear as  above  occurs  (more  than  normal  polishing),  replace both the shaft and associated bushings. Also check the hydraulic system for excess contamination in the fluid and for filter condition. Operating  conditions  may  require  changing  from  a  25- micron filter to an oversized 10-micron filter. RE-ASSEMBLY • Be sure to replace all exposed seals with new parts. • Apply clean grease or o-ring lubricant to all parts during reassembly. 1.    Carefully   install   the   quad   ring   (18)   into   the groove  on  the  inside  of  the  seal  gland  (16).    Carefully install the o-ring (17) onto the smaller outside diameter of the  seal  gland  (16)  and  install  the  seal  gland  into  the bore  of  the  bearing  housing  (9).    Replace  the  retaining ring (15). 2.    To  replace  the  bearing  (13)  on  the  drive  shaft (11), support the bearing inner race and press the drive shaft through the bearing inner race.  Install the retaining ring (14) next to the bearing on the shaft. 3.    Install the bushings (3) into the housings using a typical  bearing  pusher.    Make  sure  the  bushing  is  flush with  the  surface  of  the  bearing  housing.    A  protruding bushing will bind the gears. 4.    Place the bearing housing (9) on a smooth clean arbor press surface (protected from damage)  TM96115- 667-13&P      with   the   large   bearing   bore   facing   up. Position  the  piece  so  a  clearance  hole  exists  for  the insertion of the drive shaft (11). 5.    Apply grease to the drive shaft (11) and keyway; then  insert  it  through  the   seal   gland   (16).      Using   a bearing pusher, or a sleeve/socket with a diameter of the bearing, press the bearing and drive shaft assembly into place.  Press only on the outer race.  Install the bearing retaining ring (10). 6.    Install the needle roller (12) in the keyway of the drive  shaft.    Use  grease  to  keep  the  needle  roller  in place.  Slide the drive gear (8) over the needle roller and drive shaft.  Install the idler shaft (6) and idler gear (7). 7.    Apply grease to the face seal o-ring groove; then install the o-ring (4). 8.    Note   the   screw   hole   pattern   on   the   bearing housing (9) and the gear housing assembly (1).   They will  only  assemble  one  way.    With  all  parts  aligned, carefully slide the gear housing assembly over the gears until it contacts the bearing housing. 9.    Turn  the  drive  shaft  (11)  manually  to  check  for free rotation.  Install the eight 1/4-20 x 2-1/4 inch/ 57 mm long capscrews (5) and tighten to 100-120 in-lbs torque. Recheck rotation. 10.    Connect  the  Hyrevz  motor  to  a  hydraulic  power source and check for smooth running. Note:  Make sure the hydraulic power source is running at the lowest gpm/lpm rate it can while still producing full pressure. 11.    Hyrevz  motors  will  sometimes  be  tight  and  require “break-in”.  Accomplish this by turning the 11

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