Pengo DT-5 - Manual (Page 26)

26 Two Speed (DT & RT) Series Manual
TWO SPEED HYDRAULIC MOTOR INFORMATION
SMDH MOTOR SEAL REPLACEMENT
PROCEDURE
1. With the mounting fl ange removed from the unit, lay
the fl ange on a clean surface with the pilot face down.
Using a ¼” punch or fl at head screwdriver with a bent
tip, insert this tool through the drive bearing and past
the inner seal to the outer metal edge of the outer seal
case. Tap around the seal repeatedly to push the seal
out of the bore. Do not score or scratch the seal bore
or the bearing.
2. Turn the fl ange over and remove the snap ring with
snap ring pliers.
3. The old steel back up washer and high pressure
seal should be removed by hand (little or no force
required.
4. Clean the seal bore and drive bearing thoroughly
with solvent and inspect for scratches, nicks, or burrs.
Scratches on the seal bore will lead to leaks around
the outer edge of the seal. Scratches or burrs on the
bearing will lead to bearing failure.
5. Refer to fi gure 6A for inner high pressure seal. The
“spring side” of the seal will face toward the bearing.
6. Coat the OD of the 625256 seal with Loctite 609.
Using a socket with an OD slightly smaller than the
seal bore ID (1.996 in. min) press the seal into the
bore with the lip with garter spring facing towards the
bearing with a hydraulic or arbor press. The seal must
be kept square with the bore while pushing (pusher
must not be cocked). The seal should bottom out
against the snap ring.
7. Install new 626698 rubber plug into 3/16” “weep
hole” on side of fl ange if old one is missing.
8. Remove old 66-156-19359 O-Ring from fl ange and
install new O-Ring into groove. Using grease on the O-
Ring helps keep it seated during fl ange reassembly.
9. Use a generous amount of grease on spline drive
shaft to avoid cutting seals and replace fl ange onto
unit.
10. Replace washers and nuts and torque in a criss-
cross pattern to 80-90 ft-lbs.
MATERIALS REQUIRED FOR SEAL REPLACEMENT:
• ¼” punch or fl at head screwdriver with tip bent
• Socket which OD is slightly smaller than fl ange seal bore
(seal bore ID is 1.996 in. min.)
• Snap ring pliers
• Mineral spirits or equivalent cleaning solvent
• Loctite® 609 or equivalent
• Heavy grease
• Seal Kit part number 661003
ITEM PART No. QTY DESCRIPTION
1 55-906-02-8309 2 O-RING
2 55-906-04-8309 1 O-RING
3 625133 8 BACK-UP RING
4 625256 1 SEAL 1-1/4” VITON - GREEN
5 626698 1 PLUG NEOPRENE - WEEP
6 633199 8 SEAL STRIP
7 66-028-19359 8 O-RING VITON
8 66-156-19359 1 O-RING VITON - FLANGE
9 66-158-19359 3 O-RING VITON
10 66-159-19359 1 O-RING VITON
11 66-906-06-N552-90 9 O-RING BOSS
12 66-906-20-8309 2 O-RING BOSS
13 66-906-3-8309 2 O-RING BOSS
14 69-5000-200 1 SNAP RING
15 721777 1 WASHER B/U 1-1/4” ID
16 721801 1 SEAL 1-1/4” MD HIGH PSI
17 722978 1 VENT PLUG
18 73-187-03752 1 SPRING PIN 3/16”D X 3/8”L
661003 - SEAL KIT CONTAINS:
MOTOR REPLACEMENT SEAL / O-RING PARTS
Replacement seals and o-rings are sold in one kit as listed
above. The kit is intended to provide quick and complete
replacement. Please note seal kit will not be broken apart
to supply an individual item within the kit, the entire kit must
be purchased.
NOTE: The general work area and all parts must
be clean and free of dust and dirt that could
contaminate the seal areas on the seal lips or
shaft.
NO. 69-5000-200
BACK-UP WASHER
SEAL PUSHER
SNAP RING
NO. 721777
SEAL
NO. 721801
MOUNTING FLANGE
Figure 6A