29-10 Hydraulic Pump (continued)
A. Removal (continued)
2. c. Remove hardware securing G779-1 pulley to F908-1 yoke assembly and slide
pulley aft (do not scuff paint on tail rotor drive fan shaft).
3. Remove hydraulic reservoir filler-vent and temporarily install an air-tight plug.
4. Refer to Figure 12-4. Remove F902 suction line assembly and protect exposed line
and fitting openings.
5. Remove F902 pressure line assembly and protect exposed line and fitting openings.
6. Remove aft jam nut from both MR rpm senders and remove both senders from bracket
attached to hydraulic pump. Temporarily secure senders away from drive train to
prevent damage.
7. Remove four self-locking nuts and washers securing pump to gearbox and remove
pump and o-ring. Discard o-ring. Protect pump opening on gearbox.
B. Installation
1. Prelubricate new o-ring with gearbox oil and install on pump mounting flange. With
pump bracket pointing down, install pump on gearbox and secure. Special torque nuts
per § 20-33.
2. Install both MR rpm senders in pump bracket. Adjust clearance between both senders
and both yoke magnets to 0.040/0.020 inch and hand-tighten sender jam nuts.
3. Refer to Figure 12-4. Install F902 pressure line assembly and special torque per § 20-
33.
4. Install F902 suction line assembly and special torque per § 20-33.
5. Remove temporary air-tight plug from reservoir and adjust fluid level as required. Install
filler-vent and special torque per § 20-33.
6. Torque stripe jam nuts and B-nuts.
7. Bleed hydraulic system per § 12-34.
8. Install a 110-4 Telatemp on aft surface of pump.
9. For helicopters with air conditioning:
a. Position G779-1 pulley on F908-1 yoke assembly. Install hardware, standard
torque nuts per § 20-32, and torque stripe per Figure 5-1.
b. Route B173-5 v-belt onto pulleys. Rotate compressor up and outboard to tension
belt, then tighten hardware securing compressor to weldment. Adjust belt until
4.5-5.5 lb of force applied mid-span deflect belt 0.16-inch. Standard torque bolts
per § 20-32 and torque stripe per Figure 5-1.
10. Install tailcone cowling per § 53-23.
MAY 2015 Chapter 29 Hydraulics Page 29.3
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