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R R R R  (2) Prepare a small quantity of a mixture of: - 58 % of the zinc chromate putty SPECIAL MATERIALS (Material No. 05-002) and - 42 % of the zinc powder SPECIAL MATERIALS (Material No. 05-054).
R R R  (3) Apply a quantity of the prepared mixture to: - the mating faces of the POB - the mating face of the hydraulic motor - the mating face of the PCU. 
R  (4) Apply the LUBRICANTS (Material No. 06-001) to the splined surfaces. 
R R R  (5) If installed, remove the screw, the protection cap and the packing from the replacement pressure-off brake. (Ref. Fig. 402/TASK 27-84-52-991-002)
 Subtask 27-84-52-420-050
 B. Installation of the Pressure-Off Brake
 WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
 CAUTION : USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN_______ YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU USE THE SECOND WRENCH, YOU WILL NOT LOOSEN OR TIGHTEN THE UNION TOO MUCH.
 CAUTION : YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS_______ LUBRICANT.

 

R R  Pressure-Off Brake - Removal of Storage Parts Figure 402/TASK 27-84-52-991-002
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 NOTE : The installation procedure for the pressure-off brake at the valve
____ block 25CV is given. The installation procedure for the pressure-off brake at the valve block 26CV is almost the same. The differences in the procedures are given.
 (1)
 Install the new back-up rings (12), back-up rings (15) and the new O-rings (13), O-rings (20) and the new locking rings (21) on the transfer tubes (14).

 (2)
 Install the new O-ring (4) to the POB (41).

 (3)
 Install the new back-up rings (31), back-up rings (34), the new O-rings (32), O-rings (35) and the new locking ring (30) on the
 transfer tube (33).

 (4)
 Install the transfer tubes (14),(33) in the valve block assembly
 (23).

 (5)
 Apply SPECIAL MATERIALS (Material No. 05-002) to the threads of the bolts (6).

 (6)
 Carefully install the hydraulic motor (7) on the transfer tubes (14) of the valve block assembly (23).

 (7)
 Carefully install the POB (41) on the transfer tube (33) of the valve block assembly (23).

 (8)
 Attach the POB (41) to the hydraulic motor (7) with the washers (5) and the bolts (6).

 (9)
 TORQUE the bolts (6) to between 0.87 and 0.96 m.daN (76.99 and 84.95 lbf.in).

 (10) Install the POB (41), the hydraulic motor (7) and the valve block assembly (23).
 (a)
 Install the POB (41), the hydraulic motor (7) and the valve block assembly (23) together to the differential gearbox (40).

 (b)
 Apply SPECIAL MATERIALS (Material No. 05-002) to the threads of the studs (42) and to the threads of the bolts (3).

 (c)
 Attach the POB (41) and the valve block assembly (23) to the differential gearbox (40) with:

 -
the washers (2),

 -
the bolts (3),

 -
the washers (25).

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 (d) TORQUE the bolts (3) and the nuts (24) to between 1.40 and 1.54 m.daN (10.32 and 11.35 lbf.ft).
 (11)
 Connect the hydraulic lines.

 (a)
 Remove the blanking caps and the blanking plugs from the line ends (8),(10),(11) and from the PCU (1).

 (b)
 Make sure that the hydraulic line end-fittings are serviceable.

 (c)
 Apply HYDRAULIC FLUIDS (Material No. 02-003) to the threads of the line end-fittings.

 (d)
 Connect the case drain line (8).

 (e)
 TORQUE the union nut of the case drain line (8) to between 1.5 and 1.7 m.daN (11.06 and 12.53 lbf.ft).

 (f)
 Connect the seal drain line (10) and attach it with the new tie wrap (9).

 (g)
 Connect the hydraulic lines (11).

 (h)
 TORQUE the union nuts of the hydraulic lines (11) to between 5.4 and 5.9 m.daN (39.82 and 43.51 lbf.ft).

 

 (12)
 Connect the electrical connector.

 (a)
 Remove the blanking caps from the electrical connector (22).

 (b)
 Make sure that the electrical connectors are clean and in the correct condition.
　
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