GP7150A and GP7155A Repair Instructions, To Check Valves

GP7150A and GP7155A Repair Instructions

TO CHECK VALVES

Loosen plugs (58), take out tension spring (57) and then remove the complete valve assembly (51) with either a valve tool or an M16 hexagon screw. To remove the valve adapter (56) and tension spring (57), use a pullout tool size 5. The o-ring (51H) can be removed with a bent piece of wire. To disassemble valve assembly, screw out the valve seat (51E) from the spring tension guide (51A). Check the sealing surfaces and replace worn parts. Check O-rings and support rings. Tighten plugs (58) to 107 ft.-lbs. (145 NM).

TO CHECK SEALSAND PLUNGER PIPE

Loosen nuts (49A) and remove pump head (50). Separate the plunger connection (36A) from the cross- head (25) by means of two open-end wrenches (size 22mm and 27mm). Pull seal sleeves (39) out of their fittings in the crankcase (1). Take the seal case (38) out of the seal sleeve (39). Examine the plunger parts (36A-36D), seals (42 & 39A) and O-rings. When replacing the plunger pipe (36B), tighten tension screws (36C) to 30 ft. lbs. (40 NM). Replace worn parts; grease seals with Silicone before installing.

CAUTION: Don't loosen the 3 plunger connections (36A) before the valve casing has been removed otherwise the tension screw (36C) could hit against the valve adapter (56) when the pump is being turned. Seal life can be increased if the pre-tensioning allows for a little leakage. This assists lubrication and keeps the seals cool. It is therefore not necessary to replace seals before the leakage becomes too heavy and causes output and operating pressure to drop.

MOUNTING VALVE CASING

Check O-rings on the seal case (38). Clean surfaces of seal sleeves in gear box and sealing surfaces of valve casing (50). Push the valve casing carefully on the O-rings of the seal case and centering studs (50A). Tighten nuts (49A) to 103 ft. lbs. (140 NM).

TO DISASSEMBLE GEAR

Take out plunger (36) and seal sleeves (39) as described above. Drain the oil. After removing the circlip ring (33B), lever out seal retainer (33) with a screw driver. Check seals (32 & 33A) and surfaces of crosshead (25) . Remove the crankcase cover (4). Loosen inner hexagon screws on the connecting rods (24).

Note: Connecting rods are marked for identification. Do not twist connecting rod halves. Each connect- ing rod is to be reinstalled in the same position (and orientation) on the crankshaft journals.

Push the connecting rod halves as far into the crosshead guide as possible. Check the surfaces of connect- ing rod and crankshaft (22). Take out the bearing cover (14) to one side and push out crankshaft taking particular care that the connecting rod doesn’t bend.

Re-assemble in reverse order. Regulate axial bearing clearance to a minimum of 0.1mm and a maximum of 0.15mm by means of fitting discs (20A). The crankshaft should turn easily and with little clearance. Tighten screws (24) to 30 ft.-lbs. (40 NM).

Important! The connecting rod has to be able to slightly move sidewise at the crankshaft journal.

Important! Seal (32) must always be installed so that the seal-lip on the inside diameter faces the oil. Possible axial float of the seal retainer (33) should be compensated with the shims (33C).

GP7150A specifications

The Giant GP7150A, GP7255A, and GP7155A are a series of advanced construction and agricultural machines known for their robust performance and innovative features. Each model brings a unique set of capabilities tailored to meet the diverse needs of industry professionals.

The GP7150A is designed as a versatile powerhouse, boasting an impressive engine that delivers high torque and horsepower, ensuring optimal productivity in demanding tasks. One of its main features is the advanced hydrostatic transmission that provides seamless speed control and direction changes, making it an ideal choice for those needing precision in tight spaces.

The GP7255A stands out with its enhanced lifting capacity, allowing operators to handle heavier loads efficiently. Its reinforced frame and hydraulics ensure maximum stability and performance under load. This model is equipped with state-of-the-art safety features, including an integrated monitoring system that alerts operators to potential issues, ultimately improving job site safety.

The GP7155A combines the features of both the GP7150A and GP7255A, offering a balanced solution for a variety of applications. Its engine is optimized for fuel efficiency, reducing operational costs while maximizing performance. Additionally, the GP7155A is equipped with a user-friendly interface that allows operators to access a range of machine settings easily, enhancing usability.

All three models are engineered with durability in mind. They feature high-strength materials and components designed to withstand the rigors of outdoor work, ensuring longevity and reliability. Furthermore, these machines incorporate advanced technologies such as GPS positioning and telematics, allowing for improved fleet management and easier maintenance.

In terms of comfort, the cabins of the GP7150A, GP7255A, and GP7155A are built with ergonomic designs that prioritize operator comfort. This includes adjustable seating, climate control systems, and improved visibility, which reduce fatigue and improve job performance throughout long work shifts.

In conclusion, Giant's GP7150A, GP7255A, and GP7155A models represent a significant advancement in construction and agricultural machinery. Their combination of power, efficiency, and operator comfort makes them suitable for a wide range of applications, ensuring that they remain competitive and effective choices for professionals in the field. This series is a testament to Giant’s commitment to innovation and excellence, catering to the evolving demands of the industry.